I don't know what you have heard, but Slipknot, Disturbed, System of a Down, Avenged Sevenfold, Deftones, Sevendust, Korn, etc. are not fucking metal bands. You have been misguided. You fucking suck.
P.S. The new album by Amon Amarth is called Twilight of the Thunder GOD, not Twilight of the Thunder DOG.