Critical response
On Rotten Tomatoes, the average rating of the overall series is 91%, while on Metacritic the average rating is 76 out of 100.
The first season received mostly positive reviews. On Metacritic, it has a rating of 73 out of 100, based on 34 reviews, indicating "generally favorable" reviews. On Rotten Tomatoes, the season has a 92% rating based on 263 reviews. The website's critical consensus reads: "Outlander is a unique, satisfying adaptation of its source material, brought to life by lush scenery and potent chemistry between its leads".
The Huffington Post called the first episode "... A masterpiece of impressive depth ... It is amazing!" Entertainment Weekly gave the premiere an "A−" rating, writing that it was "sexy and smart and stirring". Matt Zoller Seitz of New York magazine also praised the series, calling it "defiantly its own thing: part romance-novel fantasy, part time-travel story and part wartime drama (set across two time periods)". Sonia Saraiya of The A.V. Club gave the first six episodes an A, writing that it "does for 1743 Scotland what Downton Abbey does for 1912 England" and adding that "Outlander succeeds admirably ... it refuses to sit comfortably in any genre."
British reception was more mixed. Alastair McKay of The Evening Standard quoted Saraiya's comparison with Downton Abbey, adding "[The comparison] is entirely correct. It is magical-mystical heuchter-teuchter cobblers." Euan Ferguson of The Observer called it "gorgeous drivel" and Thomas Batten of The Guardian stated "If you love the scenery, shifting allegiances and palace intrigue of [Game of Thrones], but find yourself wishing the pace were a little slower and that the sex scenes were filmed in a more pretentious manner with lots of slow pans and softer lighting, here's your show." Graeme Virtue noted "the rather languid pace of the opening episodes", but praised the show's "rare acknowledgment of the female gaze" in its treatment of sex scenes. The Daily Telegraph also made the Game of Thrones comparison, while The Independent stated "...yes, it's a time-travelling, wish-fulfilment fantasy, but it's done with such flair and attention to detail that it's impossible not to hop on board for the ride."
The second season received from Metacritic a score of 85 out of 100 based on 11 reviews, indicating "universal acclaim". On Rotten Tomatoes, it reports a 92% rating based on 234 reviews. The website consensus reads: "Outlander returns for a second addictive season of mystery and sweeping romance as Claire and Jamie take on Paris." Based on five episodes for review, Marah Eakin of The A.V. Club gave it a perfect "A" grade and wrote, "It's not just well-written and lovely to look at. It's downright immersive. ... Outlander feels important–even moreso in its second season."
The third season has a Metacritic score of 87 out of 100 based on 6 reviews, indicating "universal acclaim". Rotten Tomatoes reports a 90% rating based on 195 reviews. The website consensus reads: "Outlander's epic love story returns with the same strong storytelling and an added layer of maturity." Based on six episodes for review, Liz Shannon Miller of IndieWire gave it an "A"-grade review and wrote, "This is a show that's grown and matured since its initial premiere in ways that defied our initial expectations."
The fourth season received mostly positive reviews. It has a Metacritic score of 71 out of 100 based on 6 reviews, indicating "generally favorable" reviews. Rotten Tomatoes reports an 88% rating based on 170 reviews. The website consensus reads: "Outlander's epic romance settles into a violent fourth season, planting its flag on the American frontier while treading on darker themes."
The fifth season also received mostly positive reviews. It has a Metacritic score of 73 out of 100 based on 4 reviews, indicating "generally favorable" reviews. Rotten Tomatoes reports an 86% rating based on 142 reviews. The website consensus reads: "Outlander's romantic ardor doesn't burn as bright in this fifth season, but the Frasers remain an enthralling pair as they try to forge a home together."
The sixth season has an 89% rating on Rotten Tomatoes based on 9 reviews.
The seventh season has a 95% rating on Rotten Tomatoes based on 18 reviews. On Metacritic, it has received a score of 75 out of 100 based on 4 reviews, indicating "generally favorable" reviews.
The eighth season has a 100% rating on Rotten Tomatoes based on 45 reviews. On Metacritic, it has received a score of 80 out of 100 based on 7 reviews, indicating "generally favorable" reviews.