Doctor Doom has his own military. He also has a seat in the United Nations, right?
Voldemort only has magic, while Doctor Doom has magic, an army, medical skills, immense intelligence, and more of a fear factor due to the fact he is not Ralph Fiennes.
docter doom beats nagini.
many have pointed out that Dr.D has an army, so does Voldemort. but no one has pointed out that almost all of his minions can just appear where ever they want to. (without magical protections, (that can be beaten anyway) and assassinate him. with 2 words (if they aren't good enough to just do it without saying anything) Dr.D probably couldn't beet Snape alone, much less Voldemort and his armies.
Nothing Dr. Doom could do would even hurt Voldemort, he is immortal, he can only be killed if his horcruxes are destroyed. All Voldemort would have to do is say "Avada Kedavra" and Doom is doomed.
Voldemort's got Death Eaters and Bellatrix Lestrange. Doom's got an army of robots that can be destroyed by a simple stunning spell. Sure Doom's got magic too but Voldemort's got even stronger magic and is the world's most powerful Dark Wizard. Come on people.