I would say that Cap's last line was fantastic and very true to Steve as a Character.
If this is actually how Cap is presented in the comics I just might have to check them out. I've never followed the character all that closely, but the few times I have seen him (the animated movies, the new cartoon) he basically seemed like just some stiff, humorless, ultra-serious soldier.
He never struck me as being nearly
as warm and human and likeable as Evans shows him to be in the movie.