Skyrim - Dawnguard Review @ Kotaku

Kotaku has reviewed Dawnguard, recommending against the DLC and saying "boring, vast quests, boring vast areas":

The new quests are underwhelming: other than a few cool new concepts—like murdering a civilian while wearing Dawnguard armor so everybody thinks the Dawnguard did it—you've seen everything here before. Go here; find this; kill him; get that. There's nothing here as unabashedly awesome as, say, a certain quest at the end of the original game's Dark Brotherhood plot line.

The new areas are underwhelming: one, Soul Cairn, is just a soul-stuffed clone of Skyrim's Blackreach. It's big, purple, and completely empty. To finish its quests, you'll have to spend a lot of time walking through vast stretches of sheer nothingness. You'll have to fight a mini-boss, walk ten minutes through nothingness, fight another mini-boss, walk another ten minutes through nothingness, and so forth. This is not particularly fun, interesting, or emotionally engaging. Neither is the part where somebody asks you to hunt down ten pieces of paper and you just groan, wondering if you've accidentally stumbled into an MMORPG.