An important matter about a superhero is that he/she must compel the viewer to believe his/her. The most important thing is not, necessarily, his power. Perhaps Captain America is not the strongest one, but I am sure he is the most reliable one. another matter that attract me is that, sometimes, I think an actor helps the character and sometimes vice versa but in this case, the character and actor both helped each other. Of course, the balance is a little for the strong character of Captain America. and finally, if i were a superhero i prefer it was Captain America because it is supported by a nation.