This story and the gameplay are both amazing.
However, I want to try to help those who are gripped by the game but disappointed with the ending. I think those people have the most to lose. You get gripped, try to play through it slightly too fast, really excited to see what happens or what you discover next, but miss out on plot clues.
Take your time and think about everything that is going on, D's directions, ask if they make sense.
Henry is not superman, or a super genius. He's not solid snake or a Zelda. He's laid back. He can be manipulated.
Maybe play through a second time and ya know, take more pictures.
This game is 10000x better than Rapture btw.
Incredible experience. Leaves a lot open and a lot to think about.