That is a good point. Most of the crossovers today are branded under the X label, while back then they were in titles that some new fans never heard of. The first time I read Claremont's run, I missed out on a lot of his stories because of this. I have since found guides that literally tell you everything to read, though.
Disagree. One of my favorite things ever is the Asgardian Annuals in X-Men and New Mutants drawn by Art Adams. I think Claremont handled fantasy very well as opposed to some other writers.
I just have a hard time getting into them. Same with some of the sci-fi. I liked most of the dystopian future sci-fi that he did, but the space travel sci-fi was hit or miss. A lot of the times I wouldn't like how the tone of the book would immediately jump from Law & Order to Star Trek.