I think Superman 2 is one of the best comic book movies ever.
The trouble with superman is that he dosnt really have any good villians compared to say spiderman/batman who both have loads..if they are going to make another movie the villian has to be Brainiac
Your right about the number of enemies he can possiably face-off against. I also like the idea of Brainiac being his main adversary. They can then make refrences to future events too.