Article: Whedon discussed his other projects and The Avengers at length, but regarding the latter did state when Marvel initially approached him that he demanded to do a war movie. He also said he didn't just want it to be a typical good guy vs. similar bad guy flick as well.
"The first thing I said to the people at Marvel was, I want to make a war movie.
A lot of these movies do a beautiful setup and the hero fights a slightly larger version of himself, and it’s clean. I just wanted to dirty it up, I wanted to really put them through their paces. The feeling you get from a good movie like – oh my god it’s still coming, we’re not going to get out of this alive – that’s the feeling I wanted to make."
I really like what he is talking about. What he says about it being a war movie, we can all see in the trailers. It's good that this movie is stepping away from the original superhero movie mold. When you are thinking of what would happen in an Avengers film, wont you want the Avengers to face a major threat that results in a huge clash? Of course. If there wasn't a huge battle or war, then why even get them together?
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