I loved all the DLC. Dawnguard however, shouldn't have included Dragonbone weapons or Werewolf Perk Trees. They should have been added in a patch, or at least separate DLC while making Dawnguard cheaper. They're things that really should have been there to start with, much like mounted combat.
Honestly, the only thing I was disappointed with was the fact that the houses in Hearthfire weren't more customizable/unique, and that you can't demolish/rebuild wings. Other than that, I really liked all the DLC so far. Yeah, there are some flaws, and I wasn't expecting a perfect experience, but all in all they've blown me away so far. I really don't understand all the DLC hate this game has gotten.
When Jedi need to read PDFs, they use Adobe-Wan Kenobi.