You agree that Vampire requires Dracul right? A Dwarf Dracul anything is better than a Dracul Vampire. The Vampire gets 11 Lifesteal for 440 conversion points, while a Dwarf gets 10 damage reduction for 450. Then the Blood Pool healing, Poison/Mana Burn Immunity, and extra health barely make up for the reduced health regen and lack of resists.
The Vampire's ability to drink from his blood pools gives him piety with Dracul, allowing him to boost his life-steal much higher. With a sensation stone and a few good purchases, you should be able to hit 25 lifesteal without
the aid of Dracul. Dwarves can only hit 25 DR as a Transmuter, and that can't be converted to mana using BLUDTUPOWA. By primarily relying on BLUDTUPOWA to double his mana regeneration and then avoiding exploring while exhausted, a Vampire can mostly sidestep his atrocious health regeneration. His lack of resists are a bit of a problem at higher levels, but this guy won't
be playing a melee game against high-damage bosses.
As I said, the problem with the Vampire is primarily that he needs the right altar, glyphs, and items and he needs them early to get his combos rolling. If he gets his desired combos online he'll be level-up catapulting like mad and will easily have enough popcorn to cast the bosses to death. If he can't get the combos he needs, he's going to suck horribly. As a result, he's more nuanced rather than irredeemably bad.
But there's a lot of dungeons where the Bloodmage can't use his blood pools.
There's lots of dungeons where the Sorcerer can't leverage his strong low-level performance.