but in comic books, superheroes always fight supervillains, and we know no one is really going to die. And if anyone dies, they will always come back. In comic books, superheroes just save the day, but not the future - the same villains always come back. But that doesn't make me not enjoy the comic book. Comic books have always had super brawl fights, which are pretty damn entertaining.
DC comic writing (of the famous superheroes, i'm not talking about WATCHMEN) didn't get really interesting until I read the following creative ones - such as in Alex Ross' Kingdome Come and Justice, and Alan Moore's Superman/Wonderwoman/Batman versus Mongol (which was also animated in Justice League Unlimited cartoon but not as good as the short comic). The best DC comics i've read have not involved Luthor or Joker (both non-superpowered villains). Dark Knight Returns is great, but it's not just due to the Joker - it's just a creative, well-written book that doesn't fall into camp or predictability.
The way I look at is this:
Kryptonite with Superman is at the same level of Robin with Batman. Kryptonite and Robin have been part of those character's history, but so what? They don't really help or make it interesting - in fact they just make both characters campy.