Superman. Many people hate on him because he's "so powerful" and "boring" and because "Batman could beat him in a fight and Batman is just a normal guy and Batman Batman BATMAN" (seriously tired of everybody gushing over Batman too, by the way). And of course now, extreme right-wing douchebags hate him too because he renounced his US citizenship.
But I love the Man of Steel. He's not just a compelling character in his own right, but he's really the first, greatest, and most famous superhero ever. Superman has plenty of conflict, and his is unique in that he's just TOO powerful to the point where people simultaneously fear and rely on him at all times. He can't make a mistake, EVER, because when he does the consequences would most likely be deadly and the world would turn on him in an instant. Even with all of that weighing down on him, he cares deeply for humanity and never stops protecting them. Too many heroes are gritty, dark, angst-driven vigilantes; I'm glad to have an idealistic one like Superman to keep things in perspective. "Big blue Boy Scout" is a fucking compliment.
And also, because he's so powerful, when an even MORE powerful villain comes along, you know shit just got real.