I've always thought that the whole premise behind 'mutants' is inadequately explored. If these powers are available via mutations
, then surely the capability for psychic powers/invisibility/summoning cheesecakes at will/whatever already existed in the human genome beforehand in some capacity, right? Humans share the majority of their genes with animals and plants. Hell, 2/3 of our DNA matches with Yeast.
So why is it never the case that these mutations have naturally
occurred in animals and plants already? If a chance mutation 10,000 years back gave one member of a species of, say, wild dog a regeneration ability 'a la' Wolverine, then that's a MASSIVE advantage over absolutely everything else. Assuming that the mutations are hereditary (AFAIR, in Marvel comics they are), the members with a regenerative ability would become the dominant form of the species.
In short, the main problem I have with it is that these abilities are restricted only to humans. Just think of how animals or even plants could have changed or evolved if some of them had developed superpowers after a freak cosmic ray hit them during conception. After all, animals like the Electric Eel, the Starfish, and the Homing Pigeon have done pretty much exactly that. Take that to its absolute logical conclusion. It'll be interesting to see what happens.