I doubt it's too strange, since it was said in the pilot. I wouldn't say it's a common phrase, but it's definitely well-known.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited