Way to miss the point.
I think your point is fairly obvious, but there's only so much you can do about it.
The Avengers are: Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye.
They all happen to be white. If you're going to complain about them here, you basically have to complain about the entire series...and then you have to go back and complain about the comics. It's not this movie's fault that these characters happen to be white.
Nick Fury and Rhodey had roles that worked with this particular tale. I was surprised that Rhodey showed up at all, but I liked his involvement. And we also had the Asian doctor lady (Helen? I don't remember) who had a decent sized role.
Falcon's appearance at the end was weird. I agree that he should have appeared earlier, because in that last scene he basically showed up out of nowhere. I had to remind myself of who he was.