I have tons of albums that I think are superb or excellent with no weak moments. Just to mention a few:
Ayreon - Human equation, "Y", into the electric castle
Avantasia - both The metal opera albums
Arcturus - Aspera hiems symfonia
Bathory- Under the sign, hammerheart
Celtic frost - the first three
The beatles - Revolver, white album
Camel - mirage, Moonmadness
Dream theater - awake
Dissection - the first two albums
The first Exodus album
The first Burzum album
Rainbow - rising
Immoral - all, except the debut and the last one
The first Emperor album
Somewhere in time, killers, powerslave
First four-five Metallica ones
Countdown to exctintion
British steel, sad wings of destiny
Gnr - Appetite and the Illusions
Overkill and No sleep 'till Hammersmith
NIN - Downward spiral
Reign in blood
Pretty much anything by Sigur Ròs
Wintersun
Venom black metal