Amazingly Atmospheric!
To start off with - the Graphics. Truly breathtaking! The plane crash at the beginning wouldn't be as intense if it wasn't for the immersive fire and water effects. The lighting effects are also fantastic, shining through and on the surface.
Next - the Gameplay. The gameplay was solid, with character customisations to the roof! The splicing is excellent, and the combat system works effectively! My only criticism is the lack of variety in weapons. You only had a pistol, shotgun, tommy gun and a rocket launcher (if I recall correctly), but with the weapon customisations at hand, this more than makes up for it.
Next - the Story. It..is...remarkable! From the moment it begins, your trapped, spiralling into the world of Bioshock! Packed with twists and turns, this is one of the best stories ever created for a game!
Next - the Sound. Without the implausible sound effects and the captivating music, the astounding atmosphere would be inconcievable! The soundtrack is unlike any other. 'Nuff said!
And finally - the Atmosphere. Beyond words. Seriously, I cannot describe it. You actually feel like you are in Rapture, fearing for your life and fearful of the Splicing mutants that roam the abandoned halls of Rapture. The Big Daddy's are terrifying, and their connection with the Little Sisters is strong! They would lay down their life for them, which is unique to see something so massive protecting a tiny little girl. Like I said - beyond words.
In conclusion, buy this game. Now. Right now. What the hell are you still doing here? Go buy it!