Wow. Just a great game. The single-player, multiplayer-player, all of it's awesome.
Gameplay: 9/10
Sam Fisher is back, and hasn't lost any gameplay over the year or two since the original Splinter Cell was released. Now with even more moves and a slightly modified control scheme, PT is just as great as the original. Plus, the FPS view of the mercenaries in MP was a great idea. And I kinda like the alarm stages.
Graphics: 10/10
Wow. Amazingly even better than the original. The textures are sharper, the lighting system is even better, and really shows what the Xbox can do.
Sound: 9/10
The tunes are fitting, but forgettable. The ambient noises are awesome. The (very good) voice acting sounds kind of fuzzy, though. You'll know when you play. Doesn't hinder your expeience at all, though.
Value: 10/10
The SP is worth playing, and about 10 hours long. The MP is excellent, though, and will have you coming back for more. The spies play regular like in SP, but the merecenaries play as a FPS like Rainbow Six 3. Very tense, and fun.
Tilt: 10/10
Just play it if you don't know. I personally like Halo, and both Splinter Cell and Splinter Cell: PT (I haven't played Chaos Theory, but plan to). An amazing game, hands down.