I loved his books; the first series I picked up after finishing Tolkein, my second fantasy series. While it dragged in some of the later books, he definitely went back to the quick pace the early books in Knife of Dreams. He will be sorely missed.
On a lighter note, though, if rumors are true, a few days ago, when he knew he was dying, he took his wife, who is also his chief editor, and told her everything she needed to make sure the last book was finished. I know if I were a famous author, especially one that close to the end of the series, I'd want to make sure it ended right.