I meant more in a physical sense. He becomes the hero right away, there's no conflict there. Tony had to build his suit out of scraps, and he had to work out all the kinks, and still was conflicted about it. Thor has to learn humility and die before he can become the hero. Steve, once he has the serum, just is Captain America. Bad things happen and continue to happen, but the becoming the hero arc is very short for him, because he's already a hero before he starts. His movie is not about him becoming the hero, it's about him getting to the point where he crashes into the water. Both Thor and Iron Man's first movies end with them taking the responsibility of being the hero, Captain America's movie ends with everyone else becoming better and working harder to live up to the hero that Steve was.