Kratos. Can't stand the guy, don't see why people like him. He's just an overall asshole.
To be fair that's why people like him. The vast majority of protagonists in video games are good-hearted people who are trying to stop the obvious evil bad guys. It's refreshing to play as a bad guy who will willingly kill anybody who stands in his way of getting what he wants. He's a sadistic, murderous monster, and it's fun playing that side of a story as it doesn't happen very often.