To answer your question, I like books that aren't just gobs of descriptive text. I like dialogue, but sparse dialogue that's offset with character action. I also like being thrust into the middle of the action in the opening page.
I heard somewhere that if you can make the reader turn the page in your book when they pick it up in the store or the library, then they'll buy it. So remember that. Put all your charged energy or whatever, into the first few paragraphs.
I also like stories that don't take themselves too seriously and let the characters have a bit of fun every once in a while.
Hope that helps!