Dr Doom is an all-out loser in this contest. Anyone that can be repeatedly defeated by the freaking "Fantastic" Four is a douche. In fact, I nominate Dr. Doom for Douchebag of the Week.
Rand 'al Thor seems more like a sorcerer to me than a wizard, he didn't read books on how to channel, thats one of the issues that's driving him nuts.
These two examples pose the question : What defines the wizard? Answer : Players Handbook, pg 55.
So now Dr. Doom sucks twice. And while I could google Dr. Fate, it won't be the same xp as reading the comics, so could you please elaborate a bit on him?
I think the real contest would come down between Pug, Raistlin, and Elminster. Sure, E's got Mystra, but he would be fighting two guys that each took down gods, by themselves. So.....
Of course, Galdalf's a wild card because Tolkien never really demonstrates his power. He's supposed to be big, and badass (so he's metal?) but he never DOES anything, not really. He took down a way advanced Balor... meh. I'm of the mind that if he's supposed to be an "angel" or something, then he loses by default.
And Dumbledore loses because he touches little boys.