It gets kinda old to hear people slam him for that. There was a purpose to it, you know. And in case you don't know, I'll explain it.
In those days, there were no recap pages, and very few direct market comics shops. Comics were sold in newsstands, grocery stores, convenience stores and gas stations, and all manner of places right in the path of the general public. Any and every issue had the potential to be picked up by people who didn't know what an "X-Men" even was, with no back issues to help them get up to speed. Thus, every single issue had to explain who these people were, what they could do, and what was going on so that these new readers could get their bearings. Yes, the exposition got kinda awkward, but experienced readers understood why it was there and learned to gloss over it.
Making fun of it because it's anachronistic now in this day and age of internet resources and dedicated comics shops with an already comics-savvy audience and boxes of back issues at ready grasp may make you feel clever, but it's really just petty.