I can't really say I pick up any books expecting to dislike them, as that would probably be disqualifying for me in the first place. I don't really feel compelled to read anything that doesn't inherently sound interesting or enjoyable to me. So if there were something that seemed dislikable to me, I would likely never start it in the first place.

So that said, I go into every book expecting to enjoy it. I probably give up on 1 in 10 books or so, maybe more, which end up not being enjoyable to read. Most recently I gave up on War in Heaven by David Zindell. I hadn't enjoyed the earlier 3 books in the series all that much, and at this point didn't really see myself getting much fulfillment out of finishing the final book even though I had made it that far.