I never bothered with the other Bioshock 2 DLC, as the online stuff never really appealed (although I did play online a few times). A completely new story, though? Couldn’t resist.
Once more, they managed to find bits of Rapture that hadn’t previously been visited (it’s a big place, clearly), and like in the main Bioshock 2 game you’re a Big Daddy. It’s pretty much more of the same, really – just with new locations, story and some new weapons and stuff. The main new enemy, a Lancer Big Daddy, is a bit of a joke though, since he’s actually easier to kill than most of the normal baddies.
It took me 4 or 5 hours in total to finish the story, which was (once again) clever with a great twist. I’d seen the twist coming, but the reveal was excellent anyway.
Certainly all well worth the asking price, I’d say.