I just recently got back to playing Bioshock again, and I forgot how both fun and immersive this game was. For those curious, Bioshock is a first person shooter released on the PC and Xbox 360 last year that involves you not only using guns to get through the game, but your enviornment and genetic enhancements called Plasmids. These Plasmids let you do extrodinary things, such shoot electricity from your palm, light people aflame with the snap of your finger, or even send insects flying from your hand to attack enemies. The environment can be used to extend the uses of your plasmids. For example, if there's a bunch of people in a pool of water and you electrify the water, they will all be electricuted. If there are barrels of oil and you burn them up, they will explode. Or if you're quick enough, burn 'em, pick 'em up with telekinetics and throw a custom made explosive barrel! There are so many ways to finish off your enemies, it's amazing.
The A.I. is something else too. No two playthroughs will be quite the same. Now, I know that you've probably heard this before and shrugged it off as some sales pitch or something, but it reigns true for me. I'm on my 3rd playthrough with this game and it's very different than my last two. Enemies walk around each area of the game and interact with the environment. If they're low on health and there's a health regenerator near-by, they'll go for it to heal. If you hacked it to heal you they'll get shocked! I'd explain the story but I'd like you to discover it's twists and turns for yourself. I highly reccomend this to anyone with a 360 or high-tech PC. (And I mean HIGH. FRIGGIN'. TECH.) It's one of the best single player games on the 360 right now, has a great story, and if you don't mind replaying it, it has great replay value. You won't regret this purchase.
Personally I'm in love with Bioshock. The addictive gameplay. The eerie, horror movie environment. The amazing visuals. It's all there. I've gone through it a few times now, and I still can't get enough.