Just beat this, and the story made me sad. :( It was great though, the level design was especially well done. I could essentially explore these very wide, open levels at my own pace, and when they became confined to small corridors toward the end, it made the whole final sprint feel more urgent. While I liked the ending (especially that last audiotape, O GOD MY HEARTSTRINGS), I do think this story actually could have lended itself to the “good ending”/”bad ending” Bioshock thing better than 1 or 2 did. Killing all the little sisters should leave Porter unable to reconcile with his actions, faced with the terrible truth of his nature.