I can't stand books like House of Night, Vampire Academy, Hush, Hush, Fallen, or Shiver because they revolve around romantic plot tumors. If they fessed up and actually said that they were JUST romances, that would be alright. But they pretend to have actual plots outside of girl meets boring boy, girl meets interesting boy, girl ditches interesting boy after cheating for a while, girl gets with boring boy.
Also, I don't like the majority of YA chick-lit. I can't get into Anna and the French Kiss or any of the books with whiny entitled MCs that annoy the hell out of me like Perfect Chemistry or The Princess Diaries.
I don't like edgy contemporary like Cut, Crank, or Beautiful.
I do like contemporary in the vein of John Green, Courtney Summers, CK Kelly Martin, Melina Marchetta, Sarah Dessen, Elizabeth Scott, and Barry Lyga.
I do like sci-fi, but not Beth Revis/Lauren DeStefano psuedo-science.
I do like fantasy, but not man bashing Graceling fantasy, or Mary Sue centric Study Series fantasy.
And I could like Urban Fantasy if it wasn't basically becoming PNR. I blame Cassandra Clare for ruining that and steampunk.
I like romance. But I hate when it becomes the central focus of the story if the book pretends to have another plot. I want a return to actual stories that don't revolve around a happy ending love story. At the very least, give me a relationship that doesn't work out.