Is anyone else sick of kryptonite constantly being used to weaken Superman? How come every villain in the movie finds this green rare rock that Superman is allergic too? It's just overused and getting old. I think it's been used in the five past Superman movies (maybe not in Superman 2? - which is probably why the second one is the best one). The idea of using kryptonite in a Superman movie is very campy and cheesy as well. It's just too easy and silly to have in the movie. Give Superman a new challenge already! This is why we we need a superpowered villain. If the Superman Returns sequel uses Luthor, Brainiac, or Metallo, there's a good chance they are going to be using kryptonite against Supes.