the lack of super villains. I like how the put The Riddler in the game, but I'd rather fight a robot he created in the asylum with his genius. Or what about Two Face, or Mr. Freeze?
I understand they don't want to throw all their chips in one pile, because this leave room open for some kind of sequel. But just one more villain would be nice.
But on a good note, I LOVE the use of Scarecrow.