Night's Dark Masters provides a much more detailed and interesting description of Vampires and their moods, feelings, etc. They do feel, but they aren't human, and any attempt to ascribe human ambitions or emotions to them is ultimately futile. They crave power like humans crave water, with blood coming in as an excellent source of that power (for themselves and also over others). Vampires are, for the most part anyway, scheming, manipulative and power-mad. They mostly lack empathy and are generally self-absorbed to a nicety. They do feel love, as in the case of Vlad and Isabella, but that's about the closest they come to humans.