A good game that'll give you nightmares for days....
Gameplay remains the same really. Since your a big daddy you have a whole new arsenal and your much stronger as well. Mini turrets,traps,plasmids and tonics ALL at your fingertips. There are differences though love it or hate it. Unlike the first bioshock you can't visit old areas soo you'd better collect all you need,collect the little sisters from other big daddies and take out the big sisters before you board a train to the next local. Hacking is also now done in real time now so its harder to do. 2k added a multiplayer component to it. Standard modes here with a bioshock twist. There are server issues though and the customization is very limited compared to single player but you should have fun for about a week or so.
Bioshock is VERY creepy. though we've been (or you most likely) to Rapture before and it was scarier the first time round the calmness of little sisters is very disturbing while in a time of Chaos. Overall its a good game but I don't think its a masterpeice like the first (so I've heard)