Good read bad for setting.
Dark Sun was probably the first thing I ever became curmudgeonly about. They created this setting with all these intriguing plot seeds DMs could do all sorts of things with, then in the first licensed series meant to introduce the setting to people they destroyed a huge chunk of them. Killing Kalak off in the first book was fine, that changed the setting in a way that made it more interesting for PCs, but by the end they'd revealed WAY too much initially-mysterious backstory, killed off "The" Dragon and a few too many other key characters, altered the political situation beyond recognition (rather than just throwing a single interesting spanner in it as the first book did), shown us quite a bit of what lay outside the Tablelands (only a little of which was all that interesting)... I would have been much happier if they'd ended that series after a lot less than five books.
I don't agree that they were that good of books, either. The first two or three were very enjoyable for what they are, but the last one in particular I didn't like at all. Of course, it's hard to view them now as I would have at the time, with so much hindsight on both how the Prism Pentad itself ended and Denning's later atrocities against the
Star Wars expanded universe. (
Star by Star is probably the best piece of fiction he ever wrote, though it's damning with faint praise to some extent - it's post-NJO that my objections start in earnest.) That no doubt colours my recollections of his earlier books.