Nightcore is not "core" as OP meant it. And anyway, this thread is worthless - we have a metal/core thread (which I will bump in a sec) already, so if you wanna talk about hardcore, metalcore, deathcore, etc. please do it there.
Nightcore = shit btw, but I think there's a thread for that too. Somewhere.
Metalcore is one of my favorite genres.Hardcore punk is awesome too and I sometimes listen to deathcore too.
Nightcore is overrated.It's pretty much stolen music sped up.Of course there are some exceptions (nightcore-you look better when I'm drunk , for example , sounds better than the original) , but not enough to define this genre (which doesn't really fit in the definition of genre to be honest).