Oh, if I mentioned all the times I've seen a terrific performance in a good film where the main antagonist main motive is to prove he's intellectually superior to the good guys?
In fact, our very own Hans Landa from "Inglorious Basterds" fits that bill.
Because it's more than proving you are smarter and can beat your opponent... It's feeding a sense of self-worthiness and megalomania that has present in many negatives people in History, which is not tacky. It's also proving you're right. If you beat someone and you have an idelogy behind you (like believing your actions are justified because the Law is on your side - yeah, I'm talking about the Fed idea) then your ideology seems better.
In fact, that was the Joker's only motive in The Dark Knight: to prove he was intellectually superior, to prove he was right, to feed his broken ego. Childish? Maybe. Tacky? Well, it didn't seem so to me.