Which genre in particular draws us in, and why? The boundaries between the types presented in the poll can be fluid, and Porn is fittingly next to Romance -- I'm prepared to hear an argument for those two genres being one and the same.
For me, it's historical fiction first and foremost. Doing it right, reaching verisimilitude and maintaining it throughout the work -- that's terrific! Flaubert's Salammbo, Feuchtwanger's many novels and, closer to us in time, Mantel's Tudor England works are very good. Then mystery -- it's Sjöwall and Wahlöö for me, without whom no girl with the dragon tattoo.