You became a metal fan because of the singing?;-) that has to be more explained...
I kind of see these guttural noises as another distorted instrument. And as jc said: "once you get beyond the wall of sound and the growling" there is this "getting used to" - effect.
I remember Halloween, i immediately liked the music but these high pitched screams i found unbearable until i got used to it. I always was a fan of Mike Patton and his voice acrobatics and how he uses it as a sound-instrument.
But to come back to the drum aspect of this song, here is someome making fun of Lars Ulrich from Metallica, playing Bleed like Lars would:
BLEED but it's played like LARS ULRICHAnd here the same guy playing Metallica Master of Puppets like the drummer from Meshuggah:
MASTER OF PUPPETS but it's played like TOMAS HAAKEI don't really know why you would have to make fun of other musicians but he plays it quite well.
And here is Bleed played in 11 different styles. I have to say this youtube presentation is one of those which get on my nerves. Starts with an advertisement, the video is 5:31 long but after 2:50 the music is over and the guy starts to advertise his client and sponsor and talks about raising followers and all that BS and it is directly aimed at kids..the world is getting stupider..
But the drumming is good:
"Bleed" in 11 Drum Styles