I used to be quite into the shouty stuff, nowadays Megadeth/System of a Down is about my limit, tho I still have a soft spot for Lawnmoer Deth, purely because they obviously were in it just to have fun.
I'd however say that about 75% of death metal is derivative shit. 20% is good and 5% is genuinely great stuff.
Pretty much the same as every other genre of music.
Jazz is supposed to be one of the most creative genres out there, but you still end up with Jamie Cullum and his style of elevator music for midgets topping the jazz charts, classical music is one of the most revered genres ever, yet when you together 4 insurance salesmen with haircuts together to cover TV ads in a faux opera style, yes G4 I mean you, it knocks all the Beethoven and Mozart out of the way.
Speaking of classical btw, I LIKE classical, if a sandbox game has a classical station, there's nothing better for committing repeated vehicular murder to. However, why is it seemingly most often classical music snobs who so look down on popular music, accusing it of just being 'covers knocked out to make money', when if you look at any popular classical CD, there'll rarely be a single damn original piece on there, just another set of recordings of the same dozen tracks everyone else does? Nessun Dorma, 1818, Beethoven's 5th, that beer ad with the monkey, etc.
Now I know there's original classical works out there, I'm just saying it suffers from the same problems as all other genres, that the masses prefer mediocrity.