Just finished it, loved the atmosphere and story although found the combat a bit samey by the final couple of hours and was only using 2-3 vigors in most of the fights. I might replay on easy so I can experiment a bit more as well as picking up the recordings I missed.
The ending was fantastic, makes me want to play it again just to pick up on things I missed that will make more sense in light of the final scenes.
I'm very interested to see what my Season Pass brings
Edit: Agree with James above about this or Tomb Raider for GOTY so far. I enjoyed Tomb Raider more but Bioshock was more of an experience and will stick with me longer.
The ending was fantastic, makes me want to play it again just to pick up on things I missed that will make more sense in light of the final scenes.
I'm very interested to see what my Season Pass brings

Edit: Agree with James above about this or Tomb Raider for GOTY so far. I enjoyed Tomb Raider more but Bioshock was more of an experience and will stick with me longer.