Giant Bomb- Dawnguard offers far more than a self-contained episode in the Fallout vein--which it should, at double the price--but it falls just short of the scope of a traditional, pre-Internet boxed expansion pack. Still, it's a fine way to expand the already immense content offering of Skyrim, especially if you're still actively traipsing around those snowy hills in search of more adventure.
If Bethesda can figure out a way to combine this style of across-the-board enhancement with a more substantial new landmass in the next inevitable Skyrim add-on, it'll really have created something special. This is already a good start. 4/5