Adamjirra wrote:
Blind Guardian
Iron Maiden
Black Sabbath
Blue Oyster Cult (yes, they are considered metal, fuck you.)
Mastodon
Stripped away all the generic and cheesy power metal, Blind Guardian are still cheesy and power metal but their older stuff is still pretty good thanks to Olbrichs innovative riffs and Hansi's half-screamed-half-sung vocals. They became more or less unlistenable around A Night at the Opera though.
L Lawliet wrote:
The Fall of Troy
Protest the Hero
Primus
Godspeed You! Black Emperor
Hella
King Crimson
Priestess
Tera Melos
Tool
Porcupine Tree
Most of those aren't metal and those that are close to metal sucks. Protest the Hero is atrociously bad, wanky and cheesy. Most of the non-metal bands you posted are really good though, Priestess, King Krimson and the Fall of Troy in particular.
Now for some real god-tier metal:
At the Gates (pretty much anything before Slaughter of the Soul)
Atheist
Bathory
Burzum
Cynic
Emperor
Gorguts
Immolation
Suffocation
!T.O.O.H.!
Most of these are still cheesy, sure, but they make up for it with genuinely complex (but not self-indulgent), narrative song structures, a subtle sense of melody and in the case of the proggier bands (Gorguts, Suffo, Cynic, Atheist) a wicked sense of rhythm.