Putting Sam Jackson in the same room as a bunch of video game developers is just unfair -- the guy's awesome when he's fighting reptiles on aircraft, but when he's surrounded by engineers and programmers, he turns into a legend. Don Cheadle, too -- you get the feeling that his Academy Award-nominated dedication to the acting craft might be somewhat wasted on lines like, "Hey, you're Tony Stark, right?" and "War Machine out," but he's so talented that he throws himself into it anyway.
Also, we hear there's a game of some kind out now with these voices in it. But it's doubtful that playing the game could be any more fun than watching these guys work.