Re: AVENGERS: Grade, Reviews, Discuss, DVD & Sequel **SPOILERS**
After thinking about it, I think it would have worked. I figured out why it was cut, though.
Iron Man's scenes actually pushed the plot (at least slightly). Black Widow needed her scene because she didn't get a movie. Banner had to basically be reintroduced. Captain America had a movie and is getting a second one, so the character development scene was less necessary. Sucks because I don't think it would have hurt (and would have been nice), but it was the least necessary of all the character development scenes. I suspect Stark's scene was also kept because it's Robert Downey Jr., but there's at least an independent justification.
When on Romulus, Do as the Romulans