As much as I really
don't like a lot of their music (I've always dug "Unanswered", though), Suicide Silence are easily the best deathcore live act I've ever seen. They actually manage to sound heavy as fuck, which oh so many other deathcore bands fail to accomplish. I think it has something to do with their guitar tone. They've got more of a raw death metal tone compared to their peers.
I also probably like them live because they actually look metal as fuck, aside from Mitch obviously. Idk, I just like watching the constant pinwheel headbanging.
I must point out though that Mitch comes across to me that he needs to get his head out of his ass. I was reading some interview where he said something along the lines of "I don't write typical death metal lyrics that mean nothing, I write about shit that really matters."