One of the best games this year, all gamers need to get this!

Taken from Wikipedia:
Set in 1960, the player assumes the role of a plane crash survivor named Jack, who must explore the dystopian underwater city of Rapture and survive the mutated beings and mechanical drones within it. The game incorporates elements found in role-playing and survival horror games, and is described by the developers as a "spiritual successor" to their previous title System Shock 2.
BioShock has received "universal acclaim" from critics and has been reviewed very highly. At Game Rankings, BioShock holds an average review score of 96% for the Xbox 360, making it the highest rated Xbox 360 game released to date and the 7th highest rated game of all time, and 96% for the PC, making it the highest rated PC game released to date and the 8th highest ranked game of all time. The game has been cited as having an "inescapable atmosphere,""inconceivably great plot" and "stunning soundtrack and audio effects."The gameplay and combat system have been praised for being smooth and open-ended. Overall, reviewers have noted that the combination of the game's elements "straddles so many entertainment art forms so expertly that it's the best demonstration yet how flexible this medium can be. It's no longer just another shooter wrapped up in a pretty game engine, but a story that exists and unfolds inside the most convincing and elaborate and artistic game world ever conceived."
I downloaded it's 1.8 GB demo, and it's graphics are breath-taking. Problem is, I'm only 10 minutes into the game, so I can't say the same about the game-play, but it looks promising.