A book that disappointed you.
Rather than an individual book that disappointed me, I’m going to write about a whole damn series that did.
That series is the Anita Blake novels by Laurell K. Hamilton. I know plenty of people who love them, but I had high hopes from the first book that they were going to be a kickass series about a mystery-solving necromancer and instead I got a series that has devolved into being about a superwoman who can do anything and the increasingly ridiculous things that happen so that she will have serious enough bad guys to challenge her and an excuse to have lots and lots of sex.
I really liked the first book, Guilty Pleasures. It was basically a supernatural mystery. Not fantastic writing, but enjoyable. I liked the unusual idea of the protagonist being someone who animated the dead and executed vampires for a living. The next couple books were okay, although once the love triangle between Anita, Richard, and Jean-Claude developed, I started rolling my eyes. I’ve never liked the whole love-triangle device. And then Anita started getting new superpowers in every book and I just… lost interest. I haven’t heard anything about the newer books to make me change my mind.