Personally I think that vampires need the following stats:
Pros: Bloodlust, Double Jump, Flight, no starve, no breath.
Cons: Weak to wood, 10% chance of losing vampness when hit with holy water, holy water does damage, weak to fire, can't be out in daylight, can't eat.
Here is why I think they need so many cons: Stven1234 used bloodlust + high unarmed to disarm me, then go up onto a roof I can't reach, waited till he turned passive, then stuck the weapon into his backpack (where I couldn't get it even if I killed him). He did this twice, taking 2 high-level diamond swords from me. Since ANY vampire with the same cocky, jerkish attitude could do this with ease, they need far greater limitations and sacrifices. As they are right now they are WAY overpowered and beyond obnoxious an cocky. Hell, it's practically a weakness to be anything but a vampire.