Splinter cell chaos theory is the one of the best xbox games out there. The graphics are amazing and the gameplay is ace
Improvements:
The differences between it and pandora tomorrow is the ability to choose whatever option you want. Whether it is stealth or assualt. There is now an option to save whenever you want. Even in a gunfight. There is now no rush to get to a checkpoint. The graphics are alot better and get the best out of the xbox. There are now choises to what equipment you may bring into a mission. I mainly choose the recommendation.
Gameplay:
Lots of amazing moves can be done on Chaos theory. E.g. hanging upside down, whilst taking two guys out in the head.
It is pretty much the same as pandora tomorrow with a few new moves.
Graphics:
The best i have seen on a console. The bodies are amazing. The walls and buildings and night lights are superb.
Sound:
There is now a sound bar which tells you how loud the sound is in the room and your noise level which helps alot.
Lifespan:
A bit more than average for a game. But extrememly enjoyable and will attract all your attention to your xbox. Sucks up your life on Live.
Value:
It is quite cheap now which is always great for an amazing game. Around £20. Which rules.