I have to disagree... but only because you used the wrong word...
he does not have the best voice.
he has a insane unique Voice and the German Metal Hammer once called him "the Voice of Apocalypse"
That is a good describtion
Glen Benton from Deicide
George from Cannibal
Shagrath from Dimmu
Eric Adams from Manowar
Roy Khan from Kamelot
Gallagher from Dying Fetus
Galdor from Old Man's Child
Dez from DevilDriver
Jamie from Hatebreed
And of course, Max "Face-Shredder" Cavalera