But, that's kinda the quirk of his persona. He interacts with kids and grownups in the same way, too, which is pretty rare. I like seeing how he interacts with kids, but maybe that's just me, hehe. Yes, he definitly has an enormous ego. Humorously so. It gets pointed out by the characters in the movies multiple times, but he stays the same.
I think he also cares about the whole team, as you can see in Age of Ultron; he feels the weight of their lives on his shoulders. So, yeah, hehe. I like him.