On the review aggregator website Rotten Tomatoes, the first season has an approval rating of 71% with an average rating of 5.9/10 based on 28 reviews. The website's critics consensus is, "It's intermittently funny, but in most respects, BoJack Horseman pales in comparison to similar comedies." On Metacritic, the season received a score of 59 out of 100, based on 13 critics, indicating "mixed or average reviews". Erik Adams' review of the first six episodes gave the series a C+ grade; in the review, Adams wrote that the show "spoofs the emptiness of celebrity, but does so without any novelty or true insight". Willa Paskin, writing for Slate, was more enthused. "[It] is perhaps a little more clever than it is uproariously funny, but it is often very clever, and, moreover, well-tuned to the ludicrousness of the sort of low-level fame that surrounds BoJack". She likened it to 30 Rock in its ability to "[present] big ideas without having to commit to them". Chris Mitchell of Popzara was equally optimistic about the show's future, saying that "Fans of FX's Archer or Fox's Bob's Burgers will definitely want to check this one out, as its rapid-fire delivery is always consciously spot-on". The New York Times described the show as "hilarious and ribald".[49] Margaret Lyons of Vulture gave a positive review, describing it as "radically sad. I love it."
The second half of the season, however, received much more positive reviews. Ben Travers of IndieWire believed one possible reason for mixed reviews of the show was critics reviewing only the first half of the season, with the second half changing drastically in tone and developing a darker and deeper meaning. This change was so drastic that it led to IndieWire changing its policy to only review entire seasons of shows on Netflix, instead of just the first six episodes, which would have boosted BoJack Horseman's C+ grade.
Keith Uhlich of The A.V. Club named the first season of BoJack Horseman the fourth-best motion picture of 2014.