Hello everyone.
New here to the forums, but have been ghosting for a bit and contemplating registering. Decided to go ahead and register anyways.
I'm a big fan of vampires. Always loved them and always will. I too am disappointed by vampirism in TES games because they just don't do vampires much justice. The concept itself is interesting, and though I don't like the system, I know Bethesda did what they did for a certain reason. Allow me to quote the OP and clarify my meaning.
This whole "don't drink blood as a vampire in order to become more powerful" is completely backwards.
The way it "should" work is like this:
First and foremost, sunlight should always kill you no matter what.
When you drink blood, you should instantly become as powerful of a vampire as you can be, as drinking blood is the token life giver of a vampire. In this mode, sunlight should harm you less (but still kill you if you stay in it for more than a minute or so), and you should look more human, since you would be healthier as a result of freshly rejuvenating yourself.
The longer you go without feeding, the weaker and uglier you become, and the faster you will die in sunlight as a result of being weaker.
This is your reason for needing to feed. This is what it is to be a vampire.
Make it so you can't feed while completely rejuvenated to prevent people from constantly feeding to keep all of their power maxed. They will have to wait until they are drained at least 1 level to feed, and then have to find someone to feed on. That would make deep dungeons with very few humans a great challenge. By the end, that companion of yours might start to look mighty tasty. As it should.
Also make it so that fast travel always lands you there at night. I would presume that my vampire is capable of traveling and hiding from the sun on his way there, and ensuring that he is not standing in broad daylight when he arrives.
As it is now, starving yourself of the very thing that defines you as a vampire is what makes you more powerful. It just doesn't make sense.
Anyway, that's my 2 cents. Not that it's going to change anything heh.
First, the feeding system IS reversed. However, you must understand that if Bethesda were to utilize this system, then players could easily spam-feed on all the townspeople, therefore keeping their powers at maximum. Since video games are intended to challenge one's mind, doing such would contradict that purpose. Bethesda HAD to reverse it and create a history that makes sense within the lore of TES.
The system currently in place also keeps players on their toes about what weaknesses and strengths they'd like to have as a vampire. Having an utterly powerful and god-like vampire can be tiresome at times, and a lot of fans like to roleplay as a weaker vampire in order to concur with a current storyline they've made up for their own personal reasons, possibly also to level out their already powerful character through perks, high skill levels, and currently equipped enchanted armor/weapons. Granted the system Bethesda put in place does not correspond with known non-TES vampire lore, it's in place for a reason.
The fast traveling idea you mentioned is a VERY interesting one. However, its contradictory in its own way. Traveling from one side of Skyrim to the other, could take days. It's not in Bethesda's interests to place your vampire character during fast traveling into a place you have not been to just because your character is a vampire. This would create problems in programming as well as forfeit the very idea of what fast traveling represents: an easy way to move from one place to the other while not actually having to travel there yourself. Why should Bethesda automatically place your vampire in a location you haven't been to? And what if the location you're placed in forces you to be trespassing? Is your vampire a "good" vampire? If so, then he wouldn't want to trespass, right?
Perhaps your idea could be refined. Since there are carriages present in Skyrim, there could be a "vampire carriage" that contains a coffin hidden underneath the carriage to allow vampires to transport safely without running the risk of being caught, or being subjected to sunlight. This would not only maintain the integrity of fast traveling, but also ensure your vampire emerges at the destination during night hours. But Bethesda has not thought of this. Look for mods in the future.
Yes, I am aware that vampires don't actually exist, and they can be made to be whatever they want, etc.
All I am saying is, you become a "vampire" who doesn't drink blood, which is the entire stigma about vampires to begin with. People are afraid of vampires "because" they drink blood, not because they don't.
The main point I have here is, why become a vampire, if I don't have to act like a vampire in order to enjoy the fun of being a vampire. "Vampires" in this game seem to really just be necromancers who can't go out in the sun. Essentially, if you act like a vampire and drink blood, you become human, if you act like a human and don't drink blood, you become a necromancer. It's stupid. Just sayin.
I also think that if you want your vampire powers and people to treat you normally, you should have to work for it and go out and get your vampire potion (fresh blood), instead of just waiting for a few days. Seriously, anyone making the "It would be too easy and break the game" argument are morons if you think that "waiting a few days" isn't already too easy and game breaking.

I drink some blood, fast travel to dungeon, "wait" for a few days inside the entrance, and then go on a rampage. Yeah, that's not broken.
On the flip side, if I had to drink blood in order to get my powers, I would have to feed before entering the dungeon, and then my powers dwindle the longer I stay there, if there is no source of suitable blood to feed on in the dungeon.
You can make all the excuses you want about why they did it this way, all I am saying is "vampires" who don't drink blood aren't vampires.
I can agree and disagree with most of the things said in this post. Vampires who don't drink blood are still vampires, just weaker ones (with the exception of TES vampires of course). As I stated above, the system is in place for a reason: to prevent spam-feeding and keeping the maximum powers available to the players without having any weaknesses. To call others "morons" without thinking things through is a bit hypocritical, to say the least. But I understand your reasoning behind the statement, though I disagree with it.
As for the "become necromancers" portion, this makes no sense. Necromancers are ones who can resurrect the dead through magic. So far, TES vampires don't have such an ability. Necromancy is a practice, not a special ability. I believe the word you're looking for would be "undead corpse". The less a vampire feeds, the stronger but weaker he or she becomes.
As always, people are entitled to their own opinions as to what vampires should be in this game. But that's all they are... one's own opinions. This entire post I've made is my own opinion but I'm sure a lot of people here can agree with it. Am I right about the way vampires should work in TES? Possibly. Not saying that I am or am not. It's all my opinion anyways and that's all that matters to me. Besides, Bethesda created a game set in a "fantasy world". Key word here being "fantasy". Though vampires are a fantasy in our own world, vampires are of a different fantasy in the TES world. TES is Bethesda's fantasy. Who are you to argue with it? As others have stated, if vampirism doesn't do it for you in TES games, get the PC version and make your own mod to reflect your beliefs on vampires and how they should work. Until then, if you don't like being a vampire, then don't be one. In fact, you could just "roleplay" as one. I do. Because like you, I don't like vampirism in TES. It's stupid in my opinion as well. I prefer it according to Bram Stoker's "Dracula". Enough said.
Bottom line: this is Skyrim! Enjoy it even if vampires are the same as in Oblivion.