This is the best game I have ever played in my life. And that's something. I have played a lot of games, and a lot of them have been damn good, but oh, my God. This game is really just perfect.
2K Boston (formerly Irrational) really created a masterpiece. This game is just perfect in every way one could imagine. Seriously, I couldn't find a single thing that was wrong with this game. The characters are perfectly flawed, the graphics are jaw-dropping, it plays like a charm, and there's always something to do.
This is one seriously messed up game. In one sequence of the game, you're standing in front of a crazy surgeon's office (Dr. Steinman), and it's dark. Suddenly, a light comes on, and you can see a massively deformed corpse on the ceiling. Then two more lights come on, revealing two other deformed bodies. He rambles on about how he "fixed their imperfections," and then you fight him. Moments like these, when your heart just stops are just one little piece of the whole experience of Bioshock. The opening scene of Bioshock is simply my favorite moment in all of Gaming, right from when your plane crashes to when your bathysphere is descending to show you all of Rapture. And trust me, that's not the only moment in the game to make it onto my top ten list.
One thing that's just genius about this game is that there's so much more story than the main storyline. 2K Boston built a story into literally every single room in the game. There's one room where you see two bodies lying on a bed, a diary lying on the floor, and pill bottles/syringes all around the bed. You listen to the diary about two parents lamenting the loss of their child, who was turned into a little sister. You look back at the bed with syringes and bottles, and you know what happened.
But enough of my ramblings about the greatness of the story. This game is fantastic in plenty of other ways as well. The controls are magnificent, and while they sound difficult to grasp, they honestly couldn't be any easier. You have plasmid powers and guns, both of which are swiched with a weapon wheel that works better than any other I've ever seen. You shoot your guns with RT, and use your plasmids with LT. When you've used up all your EVE, then your character simply takes out another syringe and plunges it in to his arm as if it were nothing. This fills back up your EVE tank, and you are able to use plasmids again. There are a handful of gene tonics that you can use to give you various interesting abilities--all of which are cool in their own little ways.
The plasmids are all cool, too. They range from insect swarm (where you send out a bunch of wasps at your enemies) to telekinesis (self-explanitory) to incinerate (where you shoot fireballs at enemies). Every single one has a use, and they're all balanced perfectly.
One thing that this game has been criticized for (unfairly) is its use of the vita-chamber. Vita-chambers are basically respawn points. Basically, when you die, you respawn at a vita-chamber with some health and EVE. People have complained that you can't lose because of this feature. Well, technically this is true because you can't actually die and stay dead, but act like an idiot and you'll practically lose anyway. What happens if you spend all your money on worthless junk at vending machines and run out of ammo? Huh. You're left to defend yourself against all of Rapture's insane citizens with...a wrench. Plus, the vita-chambers allow gamers of all abilities to complete the game. While I can see why people wouldn't like this feature, I respectfully disagree, as I see it as a plus.
Needless to say, the graphics are jaw-dropping, as is the art style (just look at the screenshots). This helps to bring about the whole experience. System Shock 2, great game that it was, it was held back by the visuals. If Bioshock was made when System Shock 2 was, it simply wouldn't be the same.
Everything from the creepy atmosphere, to the accessability, to the story(ies)--is perfect. As stated before, I can't find a single flaw in it, and I'd be surprised if anyone truly could. Sure, some people might have nits to pick, but I sure didn't. This is the best game for the XBOX 360. No, scratch that, this is the best game ever made.