Machine Head isn't, but the others are...sadly.
I highly doubt most metalcore bands are influenced by Korn...most are influenced by Throwdown, Earth Crisis, Discharge, etc...
Discharge is the shit.
Discharge is the shit.
I doubt most metalcore kids even know who Discharge is, so I don't see how they got thrown in as an influence.
Because those kids are usually influenced by the likes of Killswitch Engage, Shadows Fall, Atreyu, Job For A Cowboy, Unearth (I like them but that's irrelevant), etc. They're usually influenced by current trends.