I thought X-Factor was an astonishingly bad idea, poorly thought out by the editors/writers as well as in terms of "in universe" logic. RR and Coke already covered many of the reasons why. Of the Marvel creators only Chris Claremont (not surprisingly) seemed to understand the downside and he wrote a very touching issue of New Mutants in which a boy kills himself because he thinks X-Factor are coming to get him. At the end of the issue Rahne swears to get back at X-Factor but I don't know if anything in this story was ever followed up on. I have always wondered if Scott & the others ever heard of this incident, and felt remorse about it.

The incarnation of X-Factor as detective agency was great. I've read the first premiere hardcover by Peter David and really enjoyed it. I liked how Rahne had developed as a character, especially. I've been meaning to read more but just haven't had the opportunity.

I loved what Grant Morrison did with the X-Men. The school with tons of students was quite a change from the status quo, and if it had been in lesser hands I might not have liked it, but he made it work.

The "outback"/Genosha period was when I stopped collecting them for many years. But my interest in the book & characters had been waning for some time for a number of reasons, so I'm not sure that it's those ideas themselves that were the main problem.