I'm in the same boat as you. I'm more disappointed because, as I said, Hearthfire went through the same steps Dawnguard did, then Bethesda kinda dropped the ball by showing us.....this. Hell, even the trailer, imo, is laughably bad. There's a reason Gun Runner's Arsenal, Horse Armor and Frostcrag Spire didn't get their own trailer: because it's hard to hype up something that small without sounding like you're trolling people. I die of laughter at the part where they mention skeever infestations.
There's nothing wrong with the content itself (cept adoption. They should light that idea on fire and toss it off a cliff), but of COURSE this is gonna disappoint, as it should.
And yeah, I think it's a question of "is it worth it." Hearthfire is small to the point where people might not bother. Still makes more sense to me if they just would've attached the house-building feature to a bigger, Dawnguard-sized DLC.