If there is a flaw then flaw is not in when or how they made the movie but in making the movie at all. Super Hero team media is always about one member of a team or the relationship between two of the members with the other members as supporting cast. Having a movie that is equally about 5-7 larger than life personalities is a terrible idea that will only result in an unfocused mess.King Aragorn said:I saw that ''Captain America gets more screen time'' stuff before and it doesn't really matter as much as what he does in that screen time. As far as I can see it, what Iron-Man did is far more significant and overeaching.
Also, that's not an excuse, that's a flaw. Then don't make The Avengers before properly establishing those characters so it becomes a proper team up film with multiple angles instead of one.
This is why dedicated superhero team up material is typically episodic. It allows everyone to have their moment in the spotlight without compromising the stories about everyone else. This is also why these movies are episodic - they are already working on Avengers 2.
Frankly, The Avengers does a really good job of making everyone important (with the possible exception of Hawkeye.) While the focus is certainly on the Tony arc each character gets significant presence and every one of them have two or three significant character development moments.
P.S. Also, I only brought up Captain America having more screen time because I thought it was an interesting related fact. I wasn't using it as any sort of argument. If I had I would have been arguing against myself about Iron Man being the focus of the movie.