The case for naughty: He allegedly cheated on Demi -- on their sixth wedding anniversary. Was it because he let his "Two and a Half Men" paycheck go to his head? He's not even as funny as Charlie Sheen was, anyway.
The case for nice: Ashton saved "Two and a Half Men," and we don't know for sure what the state of his relationship with Demi was prior to their decision to split. It's only hearsay until Ashton himself admits to philandering.