I love urban fantasy--which I define as fantasy set in a world recognizably based on our current world (so I include both worlds where magic is "out" or known to the wide world, and worlds like Harry Potter, where it's hidden). I think this genre could use a lot more writers and perspectives, but when I want a kick-ass heroine, it's one of the first genres I turn to (it and YA!).

I like the mystery tendencies, I like the variety of characters available (good UF should have all genders, sexualities, races and creeds--or at least, acknowledge their existence), I like the dialogue and sarcasm that often populate it. There is often a tone of "us against the world" that I enjoy.

Urban fantasy isn't a perfect genre (when you find that, tell me), but I almost always enjoy reading it. It's a genre where, if I put a book down, it's not likely to be because of genre-related issues.