JMS has always been tough to rank for me as a writer.
I loved his actually writing of the character. He was also one of those rare writers that managed to make Aunt May actually interesting. He did a fantastic job of handling the Peter/MJ relationship and he could honestly write them in his sleep. So as far as the handling of the characters goes, he was always one of my favorites. I just really enjoyed his take of the character of PeterParker/Spider-man. His run had some really high moments, but damn did it have some low spots too and that's even ignoring the obvious OMD. "The Other" was flat out horrible to me. The mystical/magical angle that he always seem to want to push on the character just never worked.
Again, even as I'm writing this Im having hard time describing how I feel about him.
Best way to put it for me was that ......I loved his characters and relationships. Wrote them beautifully.....I hated some of his ideas and themes.
It's unfortunate as well but he will always be tied to OMD. Not his fault but it is what it is. He was the hired hitman....