Updated 1990 list
Annihilator - Never, Neverland
Anthrax - Persistence of Time
Artillery - By Inheritance
Demolition Hammer - Tortured Existence
Destruction - Cracked Brain
Forbidden - Twisted Into Form
Kreator - Coma of Souls
Megadeth - Rust In Peace
Slayer - Seasons of the Abyss
Sodom - Better Off Dead
Cyclone - Inferior to none
Overthrow - Within The Suffering
Mottek - Fatal Violence
Razor - Shotgun Justice
Hellwitch - Syzygial Miscreancy
Whiplash - Insult to Injury
1990 takes the cake, however, 88, 89, and 91 aren't very far behind.
It shocks me when I hear people say that 86 was thrash's creative peak because most of the albums that I hear from that year sound so primitive. 86 was most certainly a good year, but it just cant compete with the improved ability, production, and lyrics that the later years brought