About 2 hours in and it's brilliant so far. I'm obviously nowhere yet (just escaped the zeplin and saw Comstock for the first time) but I already won't give this a 10 due to the ball ache the saving system is. I feel forced to play to a next automatic save even if I want to quit to do something else. It's also a bit too easy on 'Moderate' as I'm incapacitating them with Murder of Crows and mow them down quickly. The vending machines are also very cheap. Not once have I had to plan anything whereabouts in Bioshock 1 I had to take a good few minutes to plan the fighting route and how environment could help before taking down a Big Daddy.
But art, level design, direction, graphics, voice, attention to detail; right up there with the greatest.