He and Martin (Maybe I'll throw in Rothfuss after I read Day 2) are almost all you need as a fantasy fan. Everything else is just filler.
Um, yeah, wrong. So very very wrong. Like, so wrong you've redefined the word 'wrong'.
Sanderson, Martin, Rothfuss - they're all good, but they are, honestly, but a small segment of fantasy, no matter how big they are. And calling writers like Scott Lynch, Joe Abercrombie, Neil Gaiman, Jim Butcher, Michael Moorcock, Robert Jordan, etc nothing more than "filler" is a downright insult. By stating such, you are implying that there are no other worthwhile fantasy novels out there, and, again I must declare you so very wrong it is almost painful.
Ouch. Scratch that, it IS painful.
I love Brandon's books. I mean, it should be obvious, if you consider my work on 17thShard.com. But to be honest, he hasn't been around long enough to be a true staple of the genre yet. He will become one, though, in time, and is rising fast. But he isn't quite there yet. Neither is Martin, is you ask me - let the man get some bloody books out on a bloody timely basis and maybe I'll consider it.
To consider all other fantasy "filler" is wrong and insulting, to both the authors who write it, the readers who enjoy it, and the genre as a whole.