I would, it has some pretty big areas that you can explore outside of questing and get some pretty cool gear and items out of. It also includes some of the more powerful gear, and well as some of the best looking. Overall, I would say yes, but it really depends if you enjoy exploring or not.
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yes, the vampire attacks are annoying. they aren't hard to avoid, or defend against. but they ARE super annoying. showing up at town at nighttime and being like "well i better do a lap of town to make sure no vampires are attacking before i go into my house" or showing up in town and vampires attacking and your favorite merchant gets killed so you have to reload and do that fight again.
its super annoying, takes away alot from the DLC imo. i started a new character to get ready for dragonborn and i deleted dawnguard cus well, screw it.
the quests are cool and interesting, the story is alright, the items and spells are cool too. the addition of vampire attacks was just a stupid pointless annoying addition to an otherwise great DLC.
I'd compare Dawnguard to a bigger Knights of the Nine if you had Oblivion. It takes place in the basic gameworld, and adds several quests, new items, and a few locations. There's not a ton to explore, one or two trips to each new area is probably enough to get everything that's there. Crossbows and dragon bone weapons are pretty cool though, and the Vampire lord and wearwolf skill trees add depth to those playstyles. I thought it was a little overpriced at $12(I think that's what it is), but I didn't feel like I was ripped off like I have with some past DLC.