Zombies. I just don't get 'em.
Vampires have become somewhat of a tired cliche through overuse, but I still enjoy a well-written vampire story that brings something new to the table.
And I'm probably in the minority here, but I'm getting a little tired of the "all myths are real" trope; just because a particular story involves, for example, angels and demons, doesn't mean that vampires, Bigfoot, ghosts, aliens and the Fae also have to exist in that particular fictional world.