I definitely feel the same way. I have some really bad memories of vampirism from ES IV oblivion and I plan on not doing anything with them in Dawnguard (except, you know, killing).
Yep.
I'm not bitter or mad or anything like that. A lot of people like vampires and will really enjoy this DLC. I don't expect Bethesda to make DLC just for me. If someone tells me that yeah pretty much 99% vampire related then that's fine, I'll just wait for the next DLC and go back to played Deus Ex:HR in the meantime.
EDIT:
@Descified; Thanks for that. I appreciate you can't give details given we're in the general forum but I'm glad to know that there's more to this DLC