Just curious, did you play the main quest of Skyrim or any of the side quest of Skyrim or Skyrim in general?
These same puzzles were in the regular game of Skyrim, not just Dawnguard.
I have my problems with Skyrim, the puzzles are one of an extreme few bright points in Skyrim.
Yes I played the entire game and figured out on my own the precious little cheats such as the Ohgrahm without having to look it up. I have gotten stuck on many of their puzzles because I don't google it everytime, which I don't think you should have to do. I'm glad you all can breeze through them but I find them very frustrating.
The very first quest you go to in the game is simple and not a problem, look at the claw and change the locks, but going through Folgunther is an entirely different matter. That took me hours to figure out.
Complete waste of time for me.