Tono Makt said:
Agreed here too. I was quite disappointed at how Thor and Captain America were handled in The Avengers. Neither were characters I had any particular love for before their first movies, but after watching Thor and Captain America: The First Avenger, I actually came to really like the characters in this movie universe. So seeing them so woefully wasted in the Avengers was extremely disappointing.
Did you know that Captain America actually gets more screen time than Iron Man in The Avengers? By about 30 seconds. But it doesn't feel like that because RDJ as Tony is such a powerful presence that you forget about everyone else.
In any case, I think the decision to focus on Iron Man's development was the correct decision. None of the other characters had an arc that could be usefully examined or developed in the confines of a super hero team up story that was also significant enough to thematically base a movie around.
Captain America in particular is an important one - we have only seen half of his origin story. Captain America: The First Avenger was how he got super powers and getting to know Mr Rogers. The second half of his origin story, how he came to be a modern hero, will define the character. And it has to come before anything else significant can be done with the character. Would you really have wanted that all important character arc competing for screen time with Iron Man punching Thor?
Edit: In fact, much of the cut content from The Avengers was stuff about Rogers adapting to the modern world. This was cut for several reasons, but chief among them was that it do anything useful with the character and those ideas would be better saved for later when it would fit thematically.