European people hate on any U.S. Producer doing anything electro. Fact. Especially UK people and their coveted dubstep.
Skrillex is for sure more electro-house, but the half-time drums he uses drop him into the Dubstep genre by default in most peoples minds.
Skrillex has been super innovative utilizing multipole heavy synths but combining them in a way that comes together beautifully. Something other people try and do but it doesn't come out nearly as good.
A lot of forums and DJ's hate on him because they are jealous there's no doubt about it.
Somebody (especially an American) did something besides dropping an LFO on a filter on top of some weak ass Bit Reduced wave with some wobbles but instead combined a ton of screams and stabs with it and blew up.
He can play the Piano, Guitar, Drums and sing. He's a great musician and an expert in sound design and that's why every thing comes together so well.
I've seen Datsik, Doctor P, Flux Pavilion, Skrillex, Borgore and many many others and I will add that as a performer he was hands down the best live.
Cue the jealous haters.