I think what really damages it is when a vampire's traditional weaknesses are played with. While none of us would want to meet a vampire we all know what to do if we see one. Get out the garlic, cross out fingers, put silver bullets in the 45. You can't make vampires too powerful or too immune because then it begs the question if the are so indestructible what has held them in check for so long. They should have enslaved the whole human race centuries ago.