Compare Slow Horses, Season 6 vs The Undeclared War, Season 2

The Slow Horses remain a collection of abrasive, damaged misfits that viewers have nevertheless grown deeply attached to. That affection makes the season’s danger and deaths hit harder.

The harshest finale recap says Danny became actively unlikable, with Barbara also drawing intense frustration from that reviewer.

The closing stretch drew some of the strongest praise of the season, with multiple critics calling the penultimate episode and finale gripping, brutal, and among the show’s best set pieces.

The only direct finale-quality judgment is strongly negative, calling the last episode pretty weak and predictable.

The chase scenes, fights, and later set pieces were repeatedly described as inventive, breathless, and unusually cinematic. Several reviewers felt Season 6 pushed the action to a new high without losing the show’s grubby identity.

The cyber conflict often feels visually restrained. Two reviews complain that the threat is largely button-pushing, corridor-running, or chaos described rather than shown.

The established personalities still feel sharply defined, from River’s impulsiveness to Lamb’s abrasive competence and Roddy’s ego. Reviewers praised how well the cast understands those ingrained flaws and rhythms.

Negative reviews see repeated or implausible character choices, especially the familiar political dynamic and Barbara remaining undetected or being positioned for redemption.

Returning characters are pushed into new emotional and professional territory, with River’s grief and old relationships receiving particular attention. Reviewers generally welcomed the way the season develops familiar people without rewriting who they are.

One review finds the central Danny-David-Marston dynamic too one-dimensional, saying the political relationships repeat rather than meaningfully evolve.

Reviewers repeatedly celebrated the show’s unusually reliable yearly cadence. The fast turnaround is seen as a major advantage because the story and characters stay fresh in viewers’ minds.

The four-year gap is treated as a drawback, with one critic saying the wait was so long viewers could reasonably assume the show was not returning.

Most reviewers thought individual episodes moved briskly and efficiently, especially once the season gets going. One premiere review found the opening chapter slower and more cumbersome than usual.

The episode-two recap is bluntly negative about pacing, calling the installment very slow and boring.

The premiere earns praise for efficiently setting up several threats and emotional threads at once. Reviewers also noted that the show can juggle disparate material with surprising smoothness.

One episode recap says only Vadim's portion is remotely interesting, leaving the rest of the installment weakly balanced.

The quick, acerbic dialogue remains a standout, with razor-sharp exchanges and dry wit surviving the season’s darker turn. Reviewers especially praised how the banter keeps tension from becoming monotonous.

Opinion splits dramatically: one review praises sharper, more naturalistic dialogue, while others call the talk endless, repetitive, or boring.

Defense spending, institutional compromise, media influence, and financial irregularities give the spy plot a recognizable contemporary edge. Critics who highlighted this material found it persuasive rather than decorative.

Relevance is contested. One review calls the cyber threat urgent and real, while others say the politics have not evolved, the series avoids timely AI/deepfake fears, or reality has overtaken it.

The scripts retain the series’ signature sarcasm, wit, and efficient plotting even after the lead-writer change. Reviewers who focused on the writing found the handover impressively smooth.

The favorable writing assessments emphasize sharper dialogue and engaging stories, and a returning performer says he loves the writing.

Opinions split sharply on freshness. Many critics loved the unpredictability and personal stakes, while dissenters thought the show was recycling familiar faces, chase mechanics, and a formula that has become predictable.

The finale recap finds the ending obvious and unsurprising, saying everything that happened was expected.

Enthusiasm for more Slow Horses remains extremely high among positive reviewers, with some openly hoping the series continues for many more seasons.

Interest in another season is split almost perfectly: some participants and reviewers want more and discuss future story possibilities, while one recap emphatically wants the series to stop.

The broad consensus is that Season 6 tells a strong, often excellent story with personal stakes and relentless danger. More skeptical critics found the core chase repetitive or the underlying mystery merely solid rather than exceptional.

Story reactions range from glowing praise for a thoughtful, engaging continuation to complaints that major stretches are boring, silly, predictable, or a waste of time.

Twists, returns, deaths, and reversals are among the season’s most consistently praised pleasures. Several critics described the run as unusually unpredictable and packed with major turns.

Several sources enjoy the surprises and describe the episode-two reveal as shocking, but the finale recap argues the ending contains no real surprises at all.

The assassins, constant pursuit, and uncertainty over who will survive create sustained tension across the season. Reviewers frequently described the run as gripping, anxiety-inducing, and hard to look away from.

Some sources find strong tension, a simmering threat, and edge-of-seat storytelling; others say the season has lost urgency and that its threat level remains too low.

The season uses grief, disposability, loyalty, and institutional neglect to deepen its spy-story mechanics. River’s mourning and the fate of discarded agents give the thriller more emotional and thematic weight.

Supporters value the deeper look at cyber motives and intimate human consequences, while a detractor finds the political dynamic repetitive and one-dimensional.

The season’s drama was widely praised for feeling tense, consequential, and emotionally charged. River’s grief and the threat against Slough House give the espionage plot a more personal edge.

Supporters like the shift toward intimate human drama and call it high-stakes television; a detractor says the same season has collapsed into a low-budget soap opera.

The season’s imagery drew strong praise, from its rain-soaked London atmosphere to more cinematic framing and a cold blue-green palette. Reviewers saw the visuals as a meaningful part of the darker mood.

The new season gets credit for a kinetic opening staged in a single take, one of the few visual choices specifically praised.

Adam Randall’s direction was repeatedly credited with making the season feel more cinematic, darker, and more intense. His handling of action and visual atmosphere drew especially strong praise.

Paul McGuigan's direction earns praise for injecting energy immediately through the kinetic one-take opening sequence.

The final cliffhanger is divisive: some reviewers found it breathless and brilliantly effective, while another called it a cheap send-off. Its ability to create urgency for Season 7 is not in doubt.

The finale recap is strongly dissatisfied with how the season resolves Barbara's storyline and says a different outcome would have been more satisfying.

Several critics liked how Season 6 spreads plot and development around the ensemble, but others felt the large cast and returning favorites sometimes squeeze regular characters out of focus.

Moving Danny to the foreground works for one critic, but others miss Saara's larger season-one role and argue that too much attention goes to weaker characters instead of Vadim.

The season often earns praise for making violence feel painful, messy, and grounded, but one critic objected to assassins becoming implausibly ineffective when the plot needed the heroes to survive.

The realism debate is unusually polarized: some coverage calls the cyber world grounded, real, and sadly believable, while detractors flag implausible surveillance, competence, and mole-story logic.

Most full-season reviews found Season 6 exceptionally propulsive, particularly from the second episode onward. The biggest tradeoff is that the speed can crowd out quieter emotional scenes or make the middle harder to follow.

One positive video review says the season has momentum and a simmering threat, supporting a generally favorable view of its overall forward motion.

Most critics found the twists and cliffhangers extremely effective at keeping momentum high and setting up Season 7. A minority disliked the final cliffhanger as a send-off even while acknowledging its impact.

The episode-two mole reveal is described as shocking, making that early ending one of the season's more effective turns.

Season 6 pays off long-running threads, revives earlier characters, and pushes the larger series story forward. That stronger reliance on prior seasons rewards established viewers more than newcomers.

One positive video review likes that season two directly expands the continuing story rather than feeling disconnected from what came before.

The season continues to stand out as a distinctive spy thriller by mixing bureaucratic drudgery, messy fieldwork, dark comedy, and grounded danger. Reviewers repeatedly framed that blend as something rival shows do not quite match.

Two favorable pieces recommend the season specifically as a cyber or political-tech thriller, including to viewers looking for another high-stakes espionage drama.

Kyle Soller and MyAnna Buring’s assassins were widely praised as cold, menacing threats, and Hugo Weaving’s Frank remains formidable. One negative review argued that the killers are underwritten and occasionally made implausibly incompetent.

Ed Stoppard's Richard Marston receives a concise but clear compliment as a satisfyingly villainous presence.

Grief, loss, and old relationships give Season 6 more emotional weight than a typical chase-driven thriller. Several reviewers found the deaths and River’s vulnerability genuinely affecting, though one felt the relentless pace left too little room for intimacy.

Positive coverage says the leads drive the story's emotions with gravitas, while Brooke describes the cyber material itself as shocking and frightening.

Most critics thought the ensemble was operating at a very high level, with several calling the cast’s work among the strongest the series has delivered. Even more mixed season reviews still tended to praise the performances.

Performances are one of the clearest strengths in the favorable coverage, with Simon Pegg and Siân Brooke repeatedly singled out for gravitas and emotional range.

At least one reviewer watched all six episodes in a single sitting, matching the broader sense that the compact, propulsive season is easy to tear through quickly.

One enthusiastic review specifically frames the season as an easy binge and treats immediate access to the full run as part of its appeal.

Most critics thought the show still balances brutality, grief, sarcasm, and absurd comedy remarkably well under the new showrunner. A few dissenters felt the humor had dulled, but the broader tonal identity remains intact.

One of the strongest positive reviews says the new writing gives season two a more consistent tone than the first run.

The shabby, ordinary environments remain part of the show’s charm, and the premiere’s shipping-container setting received specific praise for its sad, lived-in detail.

One harsh recap says the season feels like a low-budget soap opera, tying its limited scale to a noticeably cheaper overall presentation.

Rain, muted gray-blue tones, wide surveillance-like compositions, and everyday locations give the season a colder, more cinematic look. Reviewers generally felt the visual shift suited the darker story.

Visual reactions are mixed: the one-take opening is praised, but another review says the show's scale is too limited and a video reviewer misses more of the earlier mind-palace device.

The season continues to expand the grimy MI5 ecosystem while keeping its institutional rules, rivalries, and history central to the plot. One review specifically praised the sharp world-building behind the character arcs.

Positive coverage likes the deeper exploration of cyberspace and expanding conspiracy, while a negative recap says the season's visible scope feels too limited.

Even reviews focused only on the premiere generally found it a strong, enjoyable return. Full-season critics repeatedly described the run as compelling, riveting, and easy to stay engaged with.

This is the biggest split in the coverage: several sources find the season compelling, fun, and worth watching, while others call it boring, a waste of time, or no longer suitable entertainment.

New and returning supporting players were widely praised, with several reviewers saying the additions strengthen the ensemble. Harry Lloyd, Lenny Rush, Kyle Soller, MyAnna Buring, and others drew especially positive notices.

One favorable video review says the new ensemble players are interesting and compensate well for the absence of a notable returning performer.

Gary Oldman and Jack Lowden remain major anchors, with reviewers praising Oldman’s lived-in comic menace and Lowden’s more vulnerable, physically demanding work. Both are repeatedly described as delivering some of their strongest material.

Simon Pegg and Siân Brooke are repeatedly treated as major assets, with Pegg praised for gravitas and Brooke for carrying complex emotional material; one TV blurb is more teasing about Pegg's seriousness.

Longtime devotees are still well served by the familiar rhythms, callbacks, and returning faces, though one critic warned that viewers less invested in the formula may crave something fresher.

Appeal is sharply divided: some writers call the season must-see and urge thriller fans to jump in, while the harshest coverage says it is only good for hate-watching.

Hugo Weaving’s American accent drew one of the sharpest individual complaints, with one reviewer calling it the worst they had heard from an Australian actor.

The season’s recurring focus on who accepts blame, who ducks it, and how institutions pass responsibility upward remains a satisfying part of the show’s cynical workplace machinery.

Returning pairings—especially Jack Lowden with Olivia Cooke—were a major highlight, while new character combinations also brought fresh energy. The ensemble’s ability to bounce between bickering, affection, and danger remains a core strength.

The ensemble receives consistent praise in the pieces that discuss casting, with the season-two line-up called stellar, packed with talent, and strengthened by interesting new players.

Season 6 leans heavily on the show’s history, bringing back old characters and unresolved consequences while preserving the established tone through a leadership change. Reviewers often saw that continuity as a strength.

The roughly 45-minute episodes were praised for feeling lean and fast without seeming starved of story. The runtime helps the season keep pressure on the plot while avoiding obvious filler.

Although Season 6 combines and alters material from two Mick Herron novels, critics generally felt it preserves what makes the books and series distinctive. The adaptation changes were usually seen as thoughtful rather than damaging.

The caustic workplace comedy and Lamb’s insults still land for most critics, even against a much bleaker story. A few reviewers felt the one-liners were less sharp than in earlier seasons, so the comedy is not universally seen as peak form.

The pressure created by a hostile media figure and Taverner’s public exposure fits naturally into the season’s political machinery. One reviewer specifically praised that political-media dimension for feeling tangible.

The central hunt is easy enough to follow, but combining two novels creates moments where several storylines compete for attention. Some reviewers found the middle stretch harder to track even though the season ultimately pulls the strands together.

One reviewer found the recurring Sony game placement noticeable enough to become distracting rather than invisible background detail.

Danny and Barbara's relationship is initially praised for adding emotional richness, realism, and trust, with later pressure on the marriage giving that domestic thread extra weight.

Six episodes continue to feel like a sweet spot for this series. Critics praised the format for avoiding filler, preserving urgency, and still leaving room for plot and character beats.

Season 6 is repeatedly described as the show’s bloodiest and most brutal run, yet positive reviewers felt the violence serves suspense and consequence rather than empty shock value.

Early critical reaction was overwhelmingly positive, with roundup coverage describing Season 6 as one of the series’ strongest outings and highlighting its pace, writing, and performances.

The cyber material is praised for explaining an unfamiliar world without losing the story, and Siân Brooke describes learning about the subject as hugely educational.

The dense plotting and brisk pace encouraged repeat viewing for some critics, including one who immediately watched the whole season again. Another called it the easiest season to rewatch so far.