Complete package albums

Dark Tranquillity - Character
Bloodbath - Nightmares made flesh

Off the top of my head. I am sure there are others but in the 2 minutes I have those stand out.
 
King Crimson - Red
King Crimson - In the Court of the Crimson King
Judas Priest - Sad Wings of Destiny [maybe Epitaph is a minus here]
Mastodon - Leviathan
Neurosis - Through Silver in Blood
Neurosis - Souls at Zero
 
Black Sabbath - Black Sabbath
Manilla Road - Open the Gates, The Deluge
Hail - Inheritance of Evilness
Mercyful Fate - Melissa, Don't Break the Oath
Fates Warning - The Spectre Within
 
Depending on mood:

Vulcano - Bloody Vengeance
Fates Warning - The Spectre Within and Awaken The Guardian
Truppensturm - Salute To The Iron Emperors
Bethlehem - Dark Metal
 
Fates Warning - The Spectre Within
Mercyful Fate - Melissa, Don't Break the Oath

These. I'd also add...

Candlemass - Epicus Doomicus Metallicus
Coroner - No More Color
Iron Maiden - Killers, Piece of Mind
Judas Priest - Sin After Sin, Stained Class
Mayfair - Behind
Metallica - Ride the Lightning, Master of Puppets
Ulysses Siren - Above the Ashes

Could list a lot more tbh. The biggest factor in excluding a favorite album seems to come down to the drumming for me (e.g. Eternal Devastation, Sad Wings of Destiny, Realm's Endless War). Not that it kills any of those albums, just a lot of awesome metal out there with merely adequate drummers.
 
I think that I'd include Stained Class as well. I'm not sure why I didn't include it earlier.
 
the chasm - deathcult for eternity: the triumph
jag panzer - ample destruction
judas priest - sad wings of destiny
harvey milk - a small turn of human kindness
darkthrone - under a funeral moon
burzum - hvis lyset tar oss
slayer - reign in blood

think those come closest for me. basically just a list of my favourite albums minus the ones where i have some kind of nitpick or there's notably weak songs/sections or w/e.
 
Burzum - Hvis Lyset Tar Oss
Black Sabbath - Sabbath Bloody Sabbath
Nyktalgia - Peisithanatos
Gehennah - Hardrocker
 
Bolt Thrower - TOL
Disarmonia Mundi - Mind Tricks
Dozer - Call it Conspiracy
Devin Townsend Band - Accelerated Evolution
Evergrey - The Dark Discovery
Hail of Bullets - On Divine Winds
Running Wild - Pile of Skulls
Soilwork - Natural Born Chaos, The Ride Majestic
Smashing Pumpkins - Rotten Apples

I know there are more I'm forgetting. It's kind of annoying how many albums are just a song or two short of perfection, and I'm probably giving some of these a pass on a song or two.