That was when Marvel was at its zenith. We had the original Transformers comics, Marvel 2099, New Universe, Heroes Reborn/Return, Age of Apocalypse, Days of Future Past, Secret Wars (the original), Secret Wars II, (mostly) great artists (who later quit and formed Image), and more. I also like the Avengers' traditional comic costumes more than their's carried over from the movies, but I understand it needs to be done to draw in new readers. Also, Spider-Man still had a long-standing secret ID and marriage with MJ status-quo, which was ruined by Civil Wars later on.
In my opinion, the 80's was the pinnacle of Marvel. Maybe not for magic, that'd be the 60's because I don't think anything can top the feeling invoked by that decade, but for quality. Roger Stern on Amazing Spider-Man and Avengers, John Byrne on Fantastic Four and Alpha Flight, Bill Mantlo on Hulk and Spectacular Spider-Man, Frank Miller on Daredevil, JM DeMatteis on Captain America, Chris Claremont on X-Men and New Mutants, Walt Simonson on Thor, David Michelinie on Iron Man and later on ASM. These were classic runs on classic books.
While I'm really not that big on the 90's books, I do have nostalgic pulls for Spider-Man's Clone Saga and DeFalco's Fantastic Four. I do like Captain America from the first half of the decade.