I wasn't expecting to like Captain America...he always seemed a little boring in the comics and I didn't expect the movie to amount to much. Then I saw it and loved it...
...and then this weekend I saw The Avengers. Somehow in a team of excellent characters, he still stood out to me. A friend of mine said that in a day and age where every hero has to have a dark side, Cap stands out because he's so pure.
His looks don't hurt, either, but I really do love his conviction most importantly.