Now I know why I like the Chrons so much: when it comes to books, y'all are almost as opinionated as I am. Makes me feel right at home.
Generally I cannot stand vampires, undead thingies and such as happy, fully functional characters. Sorry guys, just don't want to read about it. Although
Weber tricked me once and I'm still unsure if I'll ever forgive him ... (I tend to finish books I've started, even when the reading gets rocky.)
YA fiction I tend to leave to those who are the intended target group. While I used to be very young for a very long time indeed, I have never quite become adult. So maybe that's why.
Stephen King. Period. I'd rather not read a-tall than any of his books.
Perdido Street Station. The story depressing. The writing a travesty of baroque. But yet strangely compelling.
Donaldson's
Thomas Covenant series. Mind you, I read all the books, if only because the more I persevered the less I wanted to stop because it would have meant that all that perseverence would have been for naught.
Terry Brooks. Read the first three Shannara books and thought it was enough boredom to last me a lifetime. Simply could not get interested.
Oh, and then there is the worst reading experience to be had in my mind: Moralizing litanies by Christian bigots (yes, I realize that this will almost always be a tautology). Most prominent example:
Richardson's
Clarissa. Easily the worst book I ever had the misfortune to read.