From PW, here is an interview with four young literary agents. An example from the five web pages of the interview:

What are you people looking for in a piece of fiction?

BARER: I like what Dan has on his Publishers Marketplace profile: the book that makes me miss my subway stop. I think everybody's looking for a book that you can't put down, that you lose yourself in so completely that you forget everything else that's going on in your life and you just want to stay up and you don't care if you're going to be tired in the morning. You just want to keep reading.