(SPOILERS) The Dawngaurd DLC is amazing. But if your the person looking to finish something within a few days...this is not for you. It's really difficult and can be tedious at times it took me literal weeks to finish. As most of you know the antagonist of the DLC is Lord Harkon. To be honest...why do you need all of the friggen elder scrolls to kill the guy!? And why do you need a bow to kill him? I never used it one arrow to kill him. And it's SO long. You have to go into many different realms. like the Soul Cairn and a weird snow elf place. When I talk about how long this DLC is to friends and family I always bring up how easy it would be to finish if you just walked into Castle Volkihar and stabbed him or something. Like I can't stress it enough. It's SO LONG. I'm talking about the Thieves Guild, College of Winterhold, and Dark Brotherhood questlines combined times two! (The dark brotherhood questline took me an hour tho) Serana is an amazing follower tho! She does get in the way once in a while but you can get over it...and also just a tip. Don't tell her to wait. There is a high chance she won't leave where she is. She will only leave to do some important diologue.
I'm not trying to drag the Dawngaurd DLC, its truly amazing and fun.I know I have said some harsh things about it but I strongly recommend it!