I agree. I generally try to get the most rude, aggressive high gain sound I can. Currently that amp would be my mark iic (way more aggressive, raw than the iic+ or iii's IME). And Justice For All always has been my favorite Metallica album for sure
I also for that reason like JBL, Altec and Crescendo speakers and '60's Gretsch Supertron pickups. Pretty much all speakers and pickups made in the last 40 years or so I also find polite, tame and just plain boring vs those great old ones they used to make. No one I know uses them for metal, but they can yield the most nasty, gritty, raw tones