I just finished Bioshock (finally!). I am really amazed at what the devs where able to accomplish with this game. I especially liked the way storytelling was handled. Those recordings became one of my favorite items in the game. Usually I'm quite bored by FPS type of games, but Bioshock really engaged me.
I loved the scene with Andrew Ryan. I loved the ending (little sister savior). I also really enjoyed the ongoing theme of questioning what it means to be human.