I gotta say, there have always been two concepts n the comics that I've absolutely detested.
1) Secondary Mutations (but everyone's listed the problems with that already)
2) The Shi'ar.
I mean, is it just me, or are the Shi'ar totally out of place in the X-men, when you consider the theme? So much of the X-men is based on global politics and human problems, that it seems a bit weird to suddenly pluck the characters in the middle of intergalactic warfare. If anything, it kind of dilutes the rest of the stories by making the problems on earth seem insignificant in comparison.
Also, I think it's kind of out of place. I mean, humans are worried about mutants because of how different they are. Wouldn't you think they'd be more upset about the - you know, aliens? The discovery of aliens would make genetic superhumans seem kind of dull in comparison.
I just thought it didn't fit, and was kind of bizarre. And I was annoyed by how much they wore focused on for so long. X-men doesn't work as a space opera. It's kind of like having Spider-man fight demons from Hell, or having Batman regularly interact with werewolves or something. It just doesn't mesh well.
Any other thoughts on this?