Speaking of 80's sequels we had Friday the 13th 9 in 1993 and Nightmare on Elm St. 6 in 1991.
Speaking as a fan of both Freddy and Jason, I like to pretend that neither of those 90's films exist. Nightmare on Elm Street 5 from 1989 also doesn't exist. Freddy's Dead was bad, but NoES 5 is boring, something a horror film should never be... especially when coming from an established, heavily popular franchise.
Wes Craven's New Nightmare is awesome, however.