For those of you who saw the Death Battle, you know how powerful Superman can be. If not, link is above for you to find out. (skip to 8:46 for his stats)
But I've found a continuity error. If Kryptonians really are that powerful, then how come a measly planet implosion/explosion killed off most of their race? I understand that they lived under a Red Sun, but they were technologically advanced. Couldn't they have evacuated their population to a yellow star?
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According to the comic series "Red Son" (Not canon but explains it) they were in a state that they were just waiting for death, so Jor-El sent Kal back in time to change the course of history so they wouldn't be like that.