I've always (always = since 1993 or so) viewed D&D as a framework of rules, on which anything can be hung. So when I think D&D, I think of a rule structure, not so much a genre.
My campaigns have mostly leaned toward science fantasy/weird fiction - like Masters of the Universe meets Conan. But that's almost coincidental, and it's not necessarily what I think when I think "D&D."