Books that change perspective from one chapter to the next. I find it very hard to keep up with the flow of the book, when I'm constantly trying to remember who's talking.
This is especially bad when the characters don't have a unique enough voice. The one I just read the characters were just to much the same, so i never knew who's head we were in. It got tedious after awhile.
I just got done with one of these. It was a good story, but may as well have just been 3rd person narrated. I gave up keeping track of who was "speaking", because the characters all sounded exactly the same, all had reasonably similar opinions, and didn't really develop the story in any way. Boring!!
When done properly, though, I do quite like multiple POV. Particularly if it's only 2 or 3 narrators, and they have opposing viewpoints.
My latest peeve though, is the alternating timeline narrative device. (Or whatever it's called).
I recently read a book that was split so one chapter was set in the character's childhood, and the next was set in her adulthood, then back to a child, and so on. The most irritating and pointless narrative device ever. I could barely keep track of either storyline, because the chapters were short, and they moved at such different rates. The childhood chapters were set over about 6 years, and the adult ones over about 3 months. The adult chapters also made references to things that hadn't happened yet in the child chapters, which was pretty annoying. It could have been done really well, I suppose, but this was a very bad example.