I think this has the potential to become an absolutely beautiful character evolution from an angry, jaded soldier railing against what he sees as a useless waste to the kind, noble, and genuinely good hero we all know and love. The inclination and personality are there, it just takes people depending on him and looking up to him to make him blossom into a man who can truly shoulder and understand the responsibility that comes with embracing who he is to everyone else. That's one of the things I love about Steve - he's comfortable enough with the reality of his person that he can use that to inspire others to be better people.

From a story point of view, this makes total sense. It's a static character that steps onto the screen, fully fledged, with no internal conflict. It's what makes Iron Man so effective - you see RDJ's Tony develop from an irresponsible genius into this man with an inhuman drive to correct the mistakes he's made in the past because deep down, he's a good person, as much as his Tony would love to tell you otherwise. Everyone has to start somewhere, even Cap.