Completely good. Usually. As fun as playing evil is, I always feel bad when I make evil decisions in games and let down characters I like. If it's a game where you're not really disappointing anyone you care about, like the original Fable, I'll always go evil. But that sort of game is a minority. If it's a game like inFamous 2 or Mass Effect where the characters you'll be letting down have really grown on you, which is most of them, I'll go good, but I'll do an evil playthrough after.
Although I still felt bad for letting down Nix.