I've recorded tons of death, trash, speed, black or whatever metal bands.
The biggest problem you can have are the guitarists. Many of them have a sound like poop in a bucket of vomit.
"Hey, I brought the new CD of (fill in whatever you dig) and I want you to make my guitar sound like that"!
MORONS!
Everything is important, even the pick you use.
If everything is right you'll hear a killer sound coming from that amp/cabinet. Without that big whoomb like most of the morons have.
Now we're talking business, place a Sennheiser MD421 in front of the best sounding speaker, for an agressive bright sound.
For more bottom, grab
a Sennheiser MD441.
For a more tight sound, go for a Beyer M88.
For a more warmer sound, try an AKG C1000..........YES, A C1000!!
A SP B1 can do a wonderful job as well.
I hate the SM57 for heavy guitars.
Remember, poop in is poop out.