I think there's definitely something to be desired about vampirism, both in the departments of utility and interest. I'm not sure the problem is necessarily DPS. I feel as though with the passives and Invigorating Drain my vampire does well enough in that department. Another couple of skills on the tree and fixing feeding so it's more practical and less cartoony (that animation needs serious help) would go a long way toward making it feel worthwhile.

I'd also like to see more content that's tailored specifically toward vampires and werewolves, but I'm not sure if ZOS wants to take the risk of gating content that way. I think it's a move that could pay off and add a little more mystery to the game, but who knows.