Check out IGN's review.
There is art here, despite what many would say isn't possible with games, from Roger Ebert to game designers like Hideo Kojima. But it's in BioShock--it's in the gorgeously realized, watery halls of Rapture. It's in a Little Sister's expression of thanks when you choose to save her, or the utter silence if you harvest instead. It's in the way the characters develop, in the testimonials of the recording boxes you pick up along the way. It's in the way the narrative is structured, and the way it blends so seamlessly with the action. Irrational had a clear vision with this game, something pulled off with remarkable precision in every department. They didn't just deliver something that's fun to play, a criterion so often cited as the benchmark of what makes a game worthwhile. BioShock stands as a monolithic example of the convergence of entertaining gameplay and an irresistibly sinister, engrossing storyline that encompasses a host of multifaceted characters. This is an essential gaming experience."