I personally think they need to balance vampirism with lycanthropy(Possible Spoilers). If a werewolf can have the ability to control when he changes, then there are no downsides to it. Where as a vampire even at stage 1 as soon as you go out in the sunlight your stam, health, and magicka don't regenerate and they're dropped. They should add a ring or an amulet or something (maybe even a patch where it just does this for you, no equipment needed) that allows you to have no downsides at vampirism stage 1, like in Oblivion.
Like all Elder Scrolls games the best vampire is a modded vampire.
Sadly, I didn't find many of Oblivions Vampire mods that great. Where as the Morrowind ones were terrific. I plan on modding Vampirism when the CS comes out.
For example: Bring back the clans and adding those from lore.