Seen 'em. It's just that the more movies there are out there to counteract the monumental hype of Twilight the better. It's not necessarily that I'm a vampire purist, but the vampire legend pre-Bram Stoker formed around the idea that your loved ones could return from the grave and attempt to take you back there with them. That was what scared the shit out of peasants and for good reason.
It's not just that a vampire could kill. They look like the people you knew, but there is something missing, and even though in life a victim would consider vampirism to be literally a fate worse than death, they embrace it and would try to deprive you of your own life and make you welcome the curse as well. It links in with what I said about people trying to understand the nature of death and mortality in the afterlife thread.
Most vampire literature and movies ignore that, but it's integral to what a vampire represents. The original Salem's Lot miniseries, though dated, is the closest thing I've seen to capturing that feeling of dread and powerlessness in the face of seeing loved ones die but not staying dead.