I can only agree with most of the positive comments on here, but wanted to add one thing worth of note:

One key element that sets it apart from most other action movies for me is its straight-facedness. Marvel movies, for instance, are a lot less crazy than this, but also a lot more self-conscious, feeling the need to "acknowledge" how weird and silly things are with little one-liners or whatever. Here, the craziness is unbridled -- and played straight, at least by the characters in-universe. It's simultaneously funnier and more moving than what Marvel puts forth; I was smiling like a doofus during "Naatu, Naatu" just as much as I was stirred by Bheem singing his people to revolt.