Under any definition of black metal.
Any definition? Seems like a foolish position, considering there is at least one definition it obviously falls under, the definition that existed immediately after that album came out. Then there's the 'first wave black metal' definition...
I think what you meant to say is, that album isn't black metal, based on what black metal became afterwards.
Slayer is highly overrated
I agree and disagree. If you cut them off at
Reign In Blood, I think they're accurately rated as one of the greatest metal bands of the 1980's, however if you go by their entire output and how much people obsess over their quite obviously crummy post-
Reign In Blood material, sure they're overrated.
even Metallica's best albums aren't THAT great.
Define "Metallica's best" otherwise this can just mean all things to all people, ie nothing.
Ride The Lightning is one of the metal GOATs in my opinion, the rest I could take or leave if I'm brutally honest.
Frankly, thrash metal is kind of a weak sub-genre, despite it's historical context and peoples nostalgia.
I think you're exactly wrong on this one, it's the opposite. Thrash metal is one of the strongest, most consistent and most broadly palatable of all the metal subgenres, and that opinion has nothing to do with nostalgia as I'm only 28 and not old enough to be nostalgic about thrash metal.
Also,
Dark Angel and
Kreator are pretty great, but I wouldn't say I agree with them being the best the genre has to offer.
More accurately I would say they produced a few works each that are the genre's best. But went to utter crap rather fast.