Vampire feeding system has never worked in TES. I was also quite dissappointed in the werewolfves too, werewolves are grey, not black... j/s I find it odd how video games turn lore into fantasy, it's supposed to be a curse, not a blessing.
Speaking of which, a clanmate made this http://steamcommunity.com/sharedfiles/filedetails/?id=12953
Curse doesn't always mean being a weak pathetic creature, vampires and werewolves are super-human but their curse is the hunger and their other weakness, as someone said its both a blessing and a curse depending on how you look at it. Balance is the key thing we need here for vampires and werewolves. werewolves are great except they have no armour rating anymore. Forced transformations once or more every month would be a cool addition.
Vampires are near useless in skyrim, we know how to manage them and use the necromage perk but we still long for their legendary strength and speed. Warrior class players or in general, the average players would not find much use in vampirism.