I'm somewhat ashamed to admit that I've only read/listened to four of Brandon Sanderson's works. I've listened to the audiobook of his novella Legion about four times, read Elantris in paperback, and read The Emperor's Soul and Steelheart in ebook. Everything has been rock solid.
I reviewed Elantris a while back. If you don't have time to click the link back to it, I stated at the end that it was probably tied for my favorite book. It's definitely in the top five.
Prior to that I reviewed The Emperor's Soul. It's a no-contest for my favorite novella. I gave it a 97% rating, which is probably the highest I've ever given any piece of fiction.
Besides his fiction, Sanderson is also a master of writing theory. I've posted in-depth analyses of his first three laws of magic (First, Second, Third) in the past. They're incredible. His college lectures (which I've listened to via writeaboutdragons.com) are massively informative and supplement the tremendous education I've acquired through the Writing Excuses podcast, the brainchild of Mr. Sanderson, Howard Tayler, Dan Wells, and Mary Robinette Kowal.
There's no need to ramble. If you haven't heard about Brandon Sanderson by now, you're most likely new to the SFF community. In that case, the best introduction to the genre you could ever ask for is dangling right in front of you. Elantris or The Emperor's Soul, take your pick.