Not sure about raid content as I've yet to find myself a good active group, but at least Veteran Dungeons aren't as punishing as you'd think. I can manage all Veteran Dungeons just fine as a Vampire, both as tank and medium armor dps. Veteran Dragonstar Arena isn't much different. It isn't Vampirism that's gonna make or break your progress.
Not sure about raid content as I've yet to find myself a good active group, but at least Veteran Dungeons aren't as punishing as you'd think. I can manage all Veteran Dungeons just fine as a Vampire, both as tank and medium armor dps. Veteran Dragonstar Arena isn't much different. It isn't Vampirism that's gonna make or break your progress.