It’s amazing that Roy Thomas can do so well on some books and then do this bad on X-Men. The book is totally running on fumes at this point, so, when you can’t think of a good way to tell a story, kill a major character: Yeah, they killed Professor X.
Also, the book was experimenting with a new title: “The X-Men Featuring [character name].” This became the new masthead for #42-48. A few examples…
It didn’t make the comic any better. This is a horrid run.
Creat0rs: Roy Thomas and Werner Roth