They're the characters we love to hate.
What makes them 'good', in the entertainment sense? Is it their backstory? Their powers? Their ability to get on your nerves? What do you think a good villain needs for you to enjoy seeing them *almost* win, only to be thwarted at the last minute? Especially after all the conflicting thoughts going around re: Lex Luthor in Batman v. Superman, it would be great if everyone could share their thoughts!