I' ve bought Dawnguard for 20€ today which is a lot of money for a "mod" like this but i thought , whatever...
Well, that thought changed after i played through 2-3 main quest which are impossible to complete.

*Spoiler*
In one yes you have to find a priest to read the elder scroll for you

The problem is: He hates you and your kind (vampire side) and you'll have to corrupt him the old vampire way first.
Unfortunally it is impossible because as soon as you use your power , you'll have to bite him to get him on your side but now it comes: He still won't follow you, he still says things like : " You don't scare me" , " I won't help you" over and over again and that's it, nothing happens and the quest can't be completed.

Since the many bugs of skyrim i thought Bethesda would've learned about its mistakes but to my surprise, they disappoint us again with a unfinished , bugged product. I read many threads about problems on the Xbox version aswell, PS3 user already say they will turn Bethesda their back and i'm not far away to say that PC user will follow them soon if this is how Bethesda now will threat their customers with false promises and late updates. I am aware of the fact that they also have other things to do but that is no excuse for the release of a full bugged game.