Rolling Stone says, "You won't have more fun anywhere than losing your shit at Avengers: Age of Ultron. And you don't have to be a Marvel geek to get with the vibe". The Guardian calls it "Whedon's heroic cavalcade of fun". Screen Rant says it's "One of the most exciting and entertaining Marvel entries."
Empire Online closes by saying, "When we’d happily watch this cast of characters just cook dinner together, it’s hard to complain because they also save the world instead." Time says, "Joss Whedon's super-sharp writing elevates the newest Marvel film beyond the pack".
The Roger Ebert site says,
I hope that even as people buy tickets out of habit, they'll see that there is, in fact, art happening on the screen, maybe for the first time since Marvel's march through American cinema started. "Age of Ultron" proves that a movie with stealth fighter jets, levitating cities and Hulk-on-robot fisticuffs can be as freewheeling as a no-budget indie.Rotten Tomatoes has a critics score of 75% and an audience rating of 84%.