Venom made his debut in the late 80s. Not that Michelinie's 90s stuff isn't to be discounted, but Michelinie made a major contribution to the 80s.
The 80s is Spider-Man's greatest decade in terms of consistency and overall range of stories and the incredible number of key writers who made their mark on Spider-Man in a single 10 year period (Stern, Defalco, DeMatteis, Michelinie, PAD, Mantlo).
Whereas the '70s is the Gerry Conway show.