A couple of thoughts re the ULTIMATE's Captain America...
First, his attitude seems a lot more realistic, to me, than many takes on the CA character. Especially as the ULTIMATES CA hasn't been thawed out all that long. Here is a guy who was, after all, a "super soldier", who had no problems fighting alongside the military, who saw nothing corny about "patriotism", etc. To him, WW2 was YESTERDAY. I am so glad that while the ULTIMATE Cap has had issues adjusting, he hasn't turned into the mopey, whiney, "who am I", "I represent the AMERICAN DREAM, not AMERICA" type of guy that so many writers have portrayed Cap as over the years. But thats just me.
Second, one of the things that (for me) makes ULTIMATES interesting is that it rarely makes things "easy" politically. Thor is...well, whatever he is... Liberal? Libertarian? Norse God? *S*... Cap is fairly "conservative". Tony Stark seems... pragmatic? The political issues tackled in ULTIMATES are usually presented in a three-dimensional, shades of gray way, without the usual heavy handed, ram it down your throat approach that I see in most other comics, when politics become an issue.
So, if Cap's political outlook/general outlook doesn't fit yours, I can see you "not liking him" (although I like ALL of the Ultimates... despite NOT sharing ALL of their political views, obviously!)... but I think the character is well-written, and pretty "logical", given his origins and how we came to be present in modern times (flash frozen just as WW2 ended).
PS - To me, if we are going to have politics in comics, we SHOULD see a diversity of political views. Lets be honest - in comics, "conservative" superheroes have all too often been presented as jack-booted thugs, like USAgent, as if the linkage (conservative/thug) was inevitable. Not looking to start a political brawl here, just noting that the Ultimates Cap is a nice change of pace. IMHO. *S