Wow...I think politics would be easier to discuss than this.
I'm going to have to go with The Punisher. There are no special powers whatsoever. No enhancements, just one guy, a crap load of guns and a really bad attitude! Unlike the other "superheroes" out there, he's the one guy that represents who we all could be.
As for Villains...Doomsday killed Superman. How much bad-arse can you be than to do that?