Although I'm by no way a fan, Korn are the only original band outof that movement (and perhaps the oldest) and by no means they can be disregarded. The downtuning, slappy bass, mid tempo drums, screaming vs moaning voice, the visuals... these guys invented the whole genre. Then a million copycats came along and stole the formula. Hey... even metal bands stole that same recipee: Sepultura, Machine Head, Pitchshifter ... even Fear Factory, Danzig and Anthrax mixed it in their sound for a couple of albums. Despite not liking what they do truth be told... Korn did the most difficult thing in music: create a genre a becoming the pack leader of a worlwide style (for better and worst).