Why you hate all entire team of X-Men so much? They are the most varied characters in Marvel!!!
It significantly suffers from too many characters, and due to the attempt of exposing those characters equally, they either have no interesting personalities, are assholes, or both. And those that took off as solo adventurers (Wolverine most importantly) also didn't pan out all that great.
They also are completely isolated from the rest of the Marvel universe - they and their villains hardly ever leave the X-Men franchise, and neither do characters from other series appear in their franchise, unless there's some big crossover thing going on. It's like they're in their own dimension, although they're just in upstate New York.
Some of the characters also have incredibly shitty powers (Gambit for instance), and I just can't explain why people like some of those characters so much.
Plus, they are infested with severe fanboyism based on nostalgia (mostly the 90s cartoon) - they could make the next 30 characters X-Men, and due to the fact there's so many of them, the X-Men fanboys would still demand more of them. That significantly turned me off from them.
I mean, just look at the "which heroes would you want to be the 2 last in the advance pack "-thread in the official forums. What feels like 99% of all the posts there ask for 1 if not 2 X-Men; I'm sure this is also a lot of people who likely haven't even bought the AP.
There's good parts about the X-Men no doubt (Magneto and Juggernaut are really awesome villains, and there's some cool characters like Nightcrawler, and cool storylines like the Phoenix saga), but the good doesn't outweigh the bad for me.