Yeah, it's odd when you look back at your own work. Some filmmakers don't look back at their work at all. I look at my work a lot, actually. I feel like I learned something while looking at stuff I've done in terms of what I'm going to do in the future, mistakes I've made and things at work or what have you.
For me, Batman is the one that can most clearly be taken seriously. He's not from another planet, or filled with radioactive gunk. I mean, Superman is essentially a god, but Batman is more like Hercules: he's a human being, very flawed, and bridges the divide.