1. Long, drawn out sex scenes. I'm not prudish, I swear, they just bore me.
2. Unrealistic female characters. (I would say "unrealistic characters" full-stop, but the female issue seems to have cropped up a LOT more in my reading lately.) Also, "strong" female characters who have no goals in life and just follow the hero around doing his bidding.
3. Technicolor Eyes/Hair, particularly stone-descriptions (coal, marble, ruby, etc.). I read a book blurb the other day where a character was describing the protagonist has having hair that was "half sunlight-kissed caramel and half bronzed autumn leaves" or something similar to that and I gagged out loud. Say it's red and move on.
4. Not telling me major details to artificially heighten suspense. Also, introducing the Whodunit character 10 pages before the reveal.
5. Neglecting the world-building implications of your daring dystopia / scifi setup. If the entire world EXCEPT North America is gone, there better be some more far-reaching affects than just all the maps having to be changed.
