Interesting...I just finished the Volkihar side of the campaign,
Well, I guess I'll do the Dawnguard version of the campaign this time, though I'm not really enthused by the thought of having to do the entire Forgotten Vale (I hate the Falmer and I often got lost) and Soul Cairn parts all over again. >_<
BTW, Skyrim was never really scary IMHO, but Dawnguard did have some hair-raising moments for me - namely with those gargoyles that suddenly spring to life once you get too close to them...