Throughout the story, I was expecting two things to happen:
1) I was expecting Isran to be a psychotic [censored] who tears the dawnguard apart almost and then rushes into battle against Harkon, only to get himself and most of Dawnguard killed.
2) I was expecting Serana to betray me and try to kill me once I had all three scrolls and the bow.
Neither of these things happened, and that's a good thing, cos those two plot devices are so overdone in lately.
My only gripe is that, after making Serana human, I will not be able to marry her, which seems odd considering how close they seem to become throughout the storyline. Is there a chance of this being "fixed" at any point? I like the idea of my hero character convincing Serana to step away from the darkness and for them to fall in love and marry afterwards.
EDIT: Also, is there a level requirement for starting the Dawnguard questline? pretty sure I heard/read somewhere that it was level 14, but I'm not sure.