Finished the game. I really loved it and I'd say it was better than the original. I really loved using the skylines in combat, that was a great innovention. I just played the whole game with Devil's Kiss and the Carbine, but I was playing on easy.
Boy, reading that article upthread about the ending gave me lots of new things to think about. That was a great story. This would make for an amazing movie, as would the original Bioshock. This is absolutely a better story than the original, though.