If I didn't like a book that much, I've forgotten it. My favorite book is usually the last one I've read. He does seem to be getting a bit darker and more meaningful with each book, but the meaning sort of sneaks in in such a way that a person could ignore it if they wanted to.

Last one read was Thief of Time. LOVED the martial arts: okidoki, shiitake, upsidazi, no-kandu, tung-pi, and deja-fu. And lines such as: "It's in the darkness where your eyes can't see. The universe becomes two halves, and you live in the half behind the eyes."

I like The Luggage and The Librarian, whose name I can't remember, and
Rincewind, who is a bumbling idiot who's capable of great deeds, which usually happen accidentally while he's Just Muddling Through (like everybody else). Death's pretty cool, but so is the Death of Rats - SQUEAK! - and The Horse...Binky.