Soon as NM #87 hit big my friends and I went and started buying up all the NM copies we could find starting with about NM #91. We had multiples of each.
I, on the other hand, collected New Mutants avidly, looked forward to it every month... until I opened up my pull list bag and saw that cover for NM #86... I took it out, put it on the shelf, and cancelled my New Mutants pull. Financially, I regret that. Tastefully, it was a wise decision. Liefeld sucked then, he continued to suck into the nineties, and he sucketh verily unto today.
I still have New Mutants 1-85, somewhere...
I do, however remember the mania that surrounded his run up through 100, and the big foofarah about him getting X-Force to replace the New Mutants title, and the subsequent big blowup when he and Todd McFarlane got the expanded ego disease and pulled out to do their own company... I would say, if memory served, the Liefeld mania hit the Asheville, NC area comic fans around issue #89 or 90...