The main char is many times more heroic and interesting than the bloodlines one, too. That fucker is all 'oh cool i'm a vampire, time to level up my powers!'
I'm not trying to shit on it that hard but I think vampire themes work well with a spiritual crisis at the core. Poor, faithful, good-hearted Christof getting drawn into the eternal night. Good contrast to the player's desire to level up his damned vampire powers asap.