No one mentioned Bathory and one person mentioned Slayer
Adramelch - Irae Melanox
Iron Maiden - Killers
Metallica - Ride the Lightning
80's Bathory is more kvlt than good and Slayer can't write an album without gradually declining half-way through.
Good calls too, specially Adramelch. Have you listen to their second album "Broken History"?
80's Bathory rules (aka is good) and influenced half the music anyone talks about on this forum, and Slayer's first 3 albums were pretty consistently good. I mean what with Reign in Blood starting off with Angel of Death/Piece by Piece and ending with Postmortem/Raining Blood, I don't see how there's a decline either way.