“Endgame” is the ultimate fan-service follow-up, so densely packed with pay-offs to relationships established in the previous films that it all but demands that audiences put in the homework of watching (or rewatching) a dozen earlier movies to appreciate the sense of closure it offers the series’ most popular characters.The New York Times has a positive review. Rolling Stone gives it 4 out of 5 stars and calls it "truly epic and thunderously exciting". John Scalzi says, "moment to moment, the film is entertaining, and savvy enough as popular entertainment to give their characters, especially the ones whose actors are at the end of their contracts, moments you can cheer and cry for them. This is Disney, folks. They know popular entertainment."
Rotten Tomatoes has a critics consensus of 95%.