Mallcore = horribly crappy non-metal.

Shit:
new Metallica = mallcore
Limp Bizkit = mallcore
Linkin Park = mallcore
Deftones = mallcore

Awesome:
Opeth = melodic metal
old In Flames = death metal
Death............ death metal
Kreator = thrash metal
Slayer = thrash metal
Megadeth = thrash metal
Amon Amarth = death metal
Immortal = black metal
Emperor = black metal
Rotting Christ = death metal
Dying Fetus = brutal death metal
Nile = brutal death metal/grindcore
Anthrax = thrash metal