I've been burned twice now. First with Name of the Wind, and again with Blood Song. Both books were incredible masterpieces, and both books were a part of an unfinished series. And at least with Blood Song, the rest of the series was pretty disappointing by comparison. I vowed to never again read an unfinished series (although, I was not burned by Harry Potter, and so far I have not been burned by Stormlight Archive)
Sanderson is probably the only writer I would bank on these days. The man is clearly the most productive writer active in his genre. Mark Lawrence is pretty good too (and I recommend his Broken Empire trilogy!).
I'll also admit to a bit of resentment towards him and GRRM, the combination of which has given me some aversion to reading series that aren't finished yet.