The film scored 88% "fresh" on Rotten Tomatoes and beat the cult classics "28 Days Later" (87%) and "28 Weeks Later" (73%). That makes the third chapter of the infected saga the most critically successful yet.
What critics are praising
According to Filmspotting reviewer Adam Kempenaar, Boyle "didn't take the easy route" and crafted a story that's not just tense, but genuinely surprising.Slate praises the cast, especially Jodie Comer and young Alfie Williams, while The Ringer calls the film "an epic that terrifies with its closeness to reality."

Source:
imdb.com
The Atlantic notes that the third installment not only matches the original but expands the universe — adding philosophical layers and commentary on modern society.
And of course, audiences are loving the sequences shot on iPhones. Remember, the filmmakers specifically developed three types of special rigs for group shooting of certain scenes.
What critics are complaining about
Main complaints center on "pretentiousness," weird editing, an illogical final scene and, quote, "a pregnant zombie on a train."Still, the film has a devoted fanbase. Those who loved it call the movie "atmospheric, unsettling, mature," and the story itself "a zombie saga worthy of the 21st century." Some even compare it to Stephen King's work and call it "the most cinematic entry in the trilogy."
Given the ending that clearly sets up a sequel, this looks like just the beginning of a new chapter. According to Wikipedia, the second part of "28 Years Later" with the subtitle "The Bone Temple" hits theaters in 2026.