Tyler Cowen answers the question: "Whose entire body of work is worth reading?"
You can read his list at the link, here is mine:
1. Vladimir Nabokov. I have still not read all of his novels, but I've read many of them over a period of decades. All of them have been good.
2. Robert Anton Wilson. You saw that one coming, didn't you? But I think all of the novels are worth reading -- in fact, all are very good except for Nature's God. The collections are also consistently good. Chaos and Beyond has been out of print for years but it's quite good.
3. Neal Stephenson.
4. Tom Perrotta.
5. Jack Vance.
6. Jane Austen.
It's surprisingly hard to come up with a long list; most major writers, after they have succeeded, manage to get lesser works into print. Also, many of the writers I am familiar with are science fiction writers, and most of those guys have to write quickly to keep the wolf at the door and inevitably turn out some minor works (e.g., Roger Zelazny.) I considered Gene Wolfe, but The Book of the New Sun seems much better to me than most of his other work.