I searched for a thread on this game but couldn't find one, surprising. Anyways, I wanted to share this IGN article based on hands-on action from the first few hours of the game.
The write up is too big to paste into this thread so I'll just quote the parting words:
Link - http://xbox360.ign.com/articles/795/795104p1.htmlBioShock is very impressive so far. We can't wait for more.