@pacovf : Of the Marvel movies I'd consider bad (so anything that isn't Avengers 1/2, Iron Man, GotG and Winter Soldier) Iron Man 3 is certainly the only one that aspires to be more than just a by-the-books superhero flick. It does try to put Iron Man in a new situation and explore the ramifications of what happened in The Avengers... I just think it fails pretty badly. There's also the problem that the villain, aside from the very funny twist, is forgettable, and to be honest I couldn't even tell you what he was really trying to achieve, which is a pretty huge flaw of the movie.
I think The Avengers and GotG are pretty close, ultimately I give Avengers the edge because the inevitable 30 minutes of huge CGI action at the end were done in a much more interesting way than in GotG (or any other Marvel movie).
@WW : Well they're family movies so they won't show people being brutally murdered, but in Age of Ultron, when Hulk goes berserk, there's a clear implication of numerous civilian casualties that cause the Avengers to get out of the public eye. IN the finale with Ultron, unquestionably thousands of people die, and I don't think the movie tries to hide that, it just won't show you that specifically because, again, family movies. I have no particular problem with that either, not everything needs to be sper dark and gritty.