Captain Universe, Abyss and Ex-Nihilo would be too much for him. Nightmask and Starbrand should give him trouble as well.
@zmasonite: he did this one cool thing where he went to the whitehouse and they had all these alarm systems in place to detect if any superhuman entered. we're talking scales so they could detect shapeshifters, phase resistant walls, cameras everywhere etc. and he let all of them go off bu used telepathy to make them "see what i wanted them to see"
@cgoodness: i was wondering the same thing....does MM even have a weakness to fire in the new 52? and if he does Thorcan make it rain fire but if MM does in fact still have the weakness how much is he effected by it i wonder?
Yes it sill affects him. It makes him think about mars and brings back the pain of his dead loved ones.