Bioshock has a long history. He started working on it after SS2 I think, and it constantly evolved. It was first revealed in 2004, as a complete different game "A'la The Fly meets Nazi underground complex" or something like that. I thought it really really sounded very ambitious. So it further developed and changed, up until the last minute where it was "crippled". Too bad, I wish we could get a game with the old concept - it sounded more like a SciFi-horror game. Yes, horror. That's what I'm missing in Bioshock the most. It just isn't scary.
Edit: Like that.