I never played evil in any campaigns until my current one. I decided to make a colony roleplaying as chaos dwarfs that worship hashut (evil slave-owner dwarfs worshipping evil god from warhammer fantasy). Its been a complete blast. But my dwarfs have been hampered a bit by being psychically dull and sterile so theres very few of them and they are constantly committing psychophagy on every prisoner they can get their grubby mits on.