I've read so many funny comments here that some people are deciding to ignore so I'll post them here and explain each one of them. It's a bit longer than I hoped, but you'll get the idea once you go through it...
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"If you don't like this feature, uninstall the DLC". People who bought the DLC want to keep using it, not uninstall it. They bought it, therefore they have the right to be here and discuss the problems of what they do not like. If they feel that the current add-on is breaking the original game, they have every right to discuss and get it fixed.
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"Vampire attacks are fine, you just svck" Not everyone is born with a skill like many posters here like to brag with. Some people are casual gamers who do not take gaming seriously, plus these kind of posts are usually meant as pure provokation instead of stating something.
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"If vampire attacks are bothering you, do not use Fast Travel" Fast travel is a feature all of us are using for 8 months already. That means that after 8 months of using it , we're supposed forget it because of a feature ? I don't think so.
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"You have shouts, use them" I must bring out the fact that many people who are playing the game , don't have most of the shouts and therefore cannot use some shouts to help against Vampire attacks (Most notably , Slow time and Whirlwind Sprint)
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"I'll just stay at level 1 because I don't want to get vampire attacks" The DLC isn't supposed to force itself upon a player in such drastic manner so that a person must avoid content to actually enjoy a game. I realise your aggravation, but posting on forums will help people like him that won't level up.
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"You should of used stats/perks more wisely" Yet again, DLC should not force the player in any way to let him not choose what he wants. If the game is forcing a certain build all the time, the game is getting repetitive and therefore boring. Diablo 3 is a great example of how using 1 build all the time, makes the game terribly boring.
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"When I get into cities, I check every street and make sure there are no casulties" Nobody wants to do this. It's boring and annoying. Nobody wants a game where you have to babysit a race of warriors. Nords are proud warriors that are surely able to defend themselves... oh wait, apparently not

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"I just avoid cities or fast travel to stables" If we're supposed to not fast travel directly to cities, why is there an option to actually fast travel directly into keeps ? Answer is simple. Because it is the way the game is meant to be played.
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"I do not want vampire attacks on the city, so I uninstalled my DLC" The person purchased the DLC and therefore has every right to use it. But if the DLC is breaking the original content and changing it so drastically, the company should do something about it.
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"I like the feature, you're just complaining" As we all know, there are over 6 billion people on this planet and each one of us is different. While some people like one thing, others like the total opposite. You're supposed to accept the opinion of others and give constructive posts with arguments so you can explain why you like the feature... insulting a person because of his opinion is wrong and makes you no better than most historical kings and rulers.
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"I don't care about the NPCs dying... I kill them myself" Some people also like having NPCs alive because they love doing all the misc. quests. The DLC which added a potental threat to these kind of NPCs makes the players who love them, actually afraid of losing them and that's why they want the attacks out from the cities.
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"You are a minority, so the company won't care" History proved a lot of times that minorities made huge differences. Being a minority does not make a person less respectable that he has no right to do something. You should know that even 1 man can make all the difference. Last thread proved that a minority of 105 players prevailed against 24 that wanted vampire attacks unchanged (It ain't much, but it's something). I'd like Bethesda to announce a pool on Facebook and see how many people would actually like to keep the feature intact... until then, this minority will keep on posting on the forums.