You obviously don't know much about vampires then, they are not always murderous and evil, they were once human and their personality doesn't change automatically over the three days. what drives them to kill is their sometimes lack of control over bloodlust or when they are insane from starvation as is the case in some oblivion vampires or if they were evil then its simply that but not all are like that. Vampires even sometimes want to be cured and become human again. Vampires can be tolerated by cultures unless you never played oblivion or even morrowind, which despite being worse than skyrim in terms of getting attacked on sight, the telvanni, some guards and the mages guild speak to you and are non-hostile AND they KNOW you are a vampire...well so did the people in oblivion if you talked them as a stage four vampire.
Vampires = evil....don't make me laugh. I suppose by that logic werewolves automatically evil as well then and daedric worshippers.
Read the wiki on them on uesp or elderscrolls wiki, its very informative on them and their respective clans.
Lmfao. Actually, i'd wager i know ALOT more about TES Vampires than you do, since i began playing TES when they introduced Vampires as playable, which was TES II: Daggerfall back in 1996, and i've kept up on the lore. You likely have just seen too much of the "romanticized" type Vampires that have been in the media for the past 10-15 years.
In Daggerfall, they didn't quite have the technology at the time to allow NPCs to identify you as a Vampire (Or even a transformed Lycanthrope). You'd lose all your ranks in every Guild you had joined (Since you had technically died), and once a year your clan or a Vampire Hunter would send you a letter. That's about as much "Vampire Recognition" there was in Daggerfall.
The Vampire Clans in Morrowind were attacked on sight by about 95% of the NPCs in the game, the only ones who wouldn't attack you on sight, were some Mage's Guild and Telvanni members, because they were curious about Vampires. Honestly, the only quest i can even remember that you could take as a Vampire that didn't involve your clan, the Mage's Guild or Telvanni, was some woman in a Redoran city wanted you to lose a fight against her son, so he'd become disillusioned with Vampires, and not want to become one anymore.
The Vampires in Oblivion were the Order, the only reason they didn't get attacked on sight was because they could hide their nature. Once they reached Lvl 4 Vampirism though where their Vampirism became plain for all to see, guess what? They got attacked on sight by just about everyone.
In TES V: Skyrim, when you reach Lvl 4 Vampirism to where your nature becomes evident, you get attacked on sight by just about everyone.
I will ignore that comment for now (try bringing up other novels and movies for once!) and reply with: janis hassildor, his wife, sybille stentor and possibly the player character if the player was a nice ...which are friendly vampires or at least not evil. The vampire prisoners of the sadistic mages were non-hostile too.
Neither Janus Hassildor nor Sybille Stentor are "good" or particularly "nice", they're just "civilized". Both of them seem to adhere to this: http://www.uesp.net/wiki/Lore:Manifesto_Cyrodiil_Vampyrum. They manipulate mortals and society for their own ends. Rona Hassildor went into a coma shortly after becoming a Vampire, before she really even got a taste of what it is like to be a Vampire.
Sure, you can play as a "good" Vampire, but don't expect the NPCs to treat you well once they realize you're a Vampire. The notion of "romantic" vampires is not common in TES series, so why would the citizens of Tamriel react to an obvious Vampire with anything less than hostility? Considering by and far, Vampires are considered to be monsters by the mortals of Tamriel. The only "romantic" Vampire that i can even think of in TES series, was Lord Lovidicus. Once the orc woman he loved found out what he was though, she left him and trapped him in his tower, and he went ape[censored].