A great way to bring in the XBox 360
Gameplay
Dark: Simple and straight to the point shooter. Some puzzles.
Datadyne: You can get lost, but they have a tracking system to point which way to go. AI is kinda bad, but decent.
Control
Dark: Easy to use and fast to pick up... especially if you are a first-person shooter fan.
Datadyne: Slow characters. Slow reload, but makes up the challenge.
Sound
Dark: Great sound effects, especially reloading sound effects. Really good "secret agent" soundtrack. Voices cast is pretty good.
Datadyne: Some tracks are terrible. Some voices can get annoying because they clash with others telling each other what is going on. (ex: "She's reloading" or "Get on me"...."Right away")
Graphics
Dark: Decent graphics. Guns have some futuristic detail.
Datadyne: Explosions are a weak. People are a bit cartoonish.
Multiplayer
Dark: If you have no one to play with, you have the option of bots! Lots of modes and great achievements for each to keep coming back for.
Datadyne: A.I. is a bit weird and sometimes not even realistic.
Overall:
It's a great game to have. It is one of the first launch titles for the 360 and lives up to it's predecessor, Perfect Dark. If you like first-person shooters, this is a must have. If not, it's still a good game to try out.