appropriate for kids, mixed results for adults

I'm not an animation snob, so I don't know how "sophisticated" this was supposed to be, but it got the job done. The script had a few touches more depth than I was expecting, in terms of the dialogue between Iron Man and Hulk-- here, they are the main characters and they inhabit the vast majority of the film- there are scarcely any civilians or human characters in general. There's a town that's referred to but you don't really see anything in the way of residents, even to get their reactions on the chaotic events going on near them.

"With Great Power Comes Great Responsibility"
Stan Lee, 1962