Ah, I apologize. English is not my first language and as such I was a tad confused seeing as how I understood incredulous to mean skeptical or unwilling to accept something as true. By the definition of the word I felt it strange to be used for something that does exist and is therefore practically impossible to be "refused to be true" as the existence of the DLC removes all doubt of "what is".
For me, from a grammatical standpoint there is a huge difference between having difficulty believing and an absolute refusal of belief.
No trouble, I understand completely. I'm sorry if I came off as rude, if so it was unintended. But, I can be a bit of an ass.
And to be clear, there are a lot of things that I do like about Dawnguard. But, they've been overshadowed by a few things I really hate.
Almost all of which are integral parts of the main plot, or the vampire lord itself.