Looking for games where you're the bad guy

After completing entropy: zero 2 for half life 2 I have an undying thirst to be evil. Something so satisfying about chasing down resistance members as a combine elite unit and mowing them down as they scream for help. I'm so sick of goody two shoes protagonists and flawed heroes where no matter what decision you make the game always ends up making you the good guy. No thanks! I want to be evil and scary >:)

Anyways any ideas?