... and I'm speechless. I even shed a tear as to how touching the story is...
I finished it yesterday and got the "evil" ending.
The entire Persephone area was amazing. That small part of Rapture contained some of the greatest gaming moments I've ever experienced in my life. I don't want to give away any spoilers, but Shade knows which scenes I'm talking about.
I do know there are some big differences in the second part of Persephone depending on the choices you made earlier, so Shade and I likely saw events unfold differently. I harvested every single one of those girls, including the last one that through careful application of Fridge Logic you realize was a minor character. And I killed all the NPCs except Grace Holloway (I couldn't bring myself to kill her). The last stretch of the game, plus the ending, throws it back at you in ways that make the first game's harvest mea culpa look amateurish. It was positively haunting.