Cap was going to be a tough character to characterize in the upcoming film without much question. They qare going to piss various levels of "patriots" off no matter what they do, and if it wasn't for the fluke success of Iron Man and the desired Avengers film, I really doubt anyone would have tried.
I never read a lot of Cap, but then, my main comic years were the 90s and those weren't his best. STill, I liked the character: all the pride in America and what it stands for, none of the ego that produced a lot of bile over the last decade. He was the kind of person that would fight for the right of the tea party to protest, then tell them off for how little help and how unpatriotic yelling, hitler moustaches on signs, and plans that were obviously self serving actually are. Hell, just his origin: despite an easy out, he WANTED to do more for his country and for others. Even as a propaganda piece, it's the kind of propaganda piece america could use more of.
Some people it seems missed the point of other country's heroes. Most have some level of heroes, be it myth, general fiction or the majority of shonen manga, but nne seem to be as overtly nationalistic as Captian America. For example, years of anime, manga and live action and the closest I came was Captian Toyko in a parody OAV. I'm not sure why, though I could come up with some non flattering theories around America's need to prove itself for a number of reasons.