Can you explain these 2 things in your posts.
๖ۣۜ First off, why the offensive rating? Common,
it's just a joke and was supposed to be lighthearted, I was not directly attacking you in any way or being offensive, besides what are the forums but a place to give your opinion on something even if it is negative? I know all you want to do is be a bit more known, recognized, and individual and I'm ok with that. I just prefer people that get noticed for something of value such as intelligence, skill at building, or at roleplaying rather than putting in a small aesthetic difference which I consider vain. Just take solace in screwing up the text I'm writing in because I don't know how to get that weird symbol without copying and pasting. So take a deep breath, and a cookie. 
Now secondly you confuse me by putting in "Smite should do damage to Vampires and Undead" and then saying that changing this would make vampires useless. Do you think one buff is better than the other or are you giving an example of a thing not implemented which you believe is better than the current suggestion and then saying however, none should be added as Vampires need to be buffed.
Ideas On The Vampire Issue
Anyways in my opinion Vampires need to have a speed 1 boost constantly during the hours of the night as well as a jump 2 boost regardless if they are bloodlusting. They should be able to bloodlust using food bar levels slowly to increase this to a speed 2 and jump 4 boost. (3 blocks) When in bloodlust, they also have a new ability called bite. Every time a vampire hits a non-vampire, there is a 5% chance he (Or she) will get a bite. A bite will do 3 things firstly, it does 5 hearts of flat extra damage. Secondly, it gives nausea 2 to its victim. Thirdly, it instantly infects a human that is bitten starting the dark disease countdown. The time it takes to be turned into a vampire by this is reduced to 75% of what it is making the dark disease a real factor in game.
Now for a neutral thing. Vampires should only get blood after a kill of a animal or player not just after a hit, though this is a large amount of blood and saturation. This just makes more sense.
Now to nerf vampires is to add in 2 new hunter things. First of all, if you put 8 lapis blocks and 1 bow (Amounts can be changed if this is OP or underpowered and this can be done with arrows if a problem with bows arises) in a crafting table it turns into a Slayer Bow, which does a set amount lets say 2 hearts of extra damage a hit and has a small chance to give nausea 1 to the vampire. Secondly there is now an enhancement called something similar to "Scourge of Vampyres" on swords or axes of any material. This enchantment does 1/2 a heart of extra damage to a Vampire. How do you get this enchantment? Well there is only one way to get it, questing. If you bring a sword or axe to a certain NPC, lets say a Crimson Inquisitioner, in return for a payment of gold or maybe lapis you get the enchantment. It is an equivalent exchange quest like the sapling one and can be done infinitely.
This quest may or may not have to be unlocked through completing several other Vampire slayer like quests which can possibly add two trees of quests, a slayer and vampire quest tree allowing for further development of the Questing system, roleplay roles and rules, and dark vs light action. Since these quests have PVP elements hopefully it can even help reconcile RP and PVP too and make a more balanced Massivecraft.
With these additions I think Vampires will have a better time being the demons they are supposed to be and Vampire slayers will have more tools to counter the Vampires, letting them develop a niche and possibly, *gasp* even be liked by the people they are protecting!
Thanks for reading, and have a Massive day!
