I'm actually going to have to go with SPECTRE here. The spectre punished a D list villain named Dr. Light who was a really creepy psychopath by turning him into a lit candle. But he never goes after A list villains who are infinitely worse, like the joker, lex luthor, darkseid, etc? At least spectre goes for big game.
Best planet destroyer. The Lexx or the deathstar?