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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They allowed gay and inter racial marriage. This polluted the Kryptonian gene pool and ended them as a species. Kal-El's parents were the last of the pure races on the planet. Everyone else died as part of God's judgement and wrath for their deviant lifestyle. (Did'ya fall for it?)