10/10 I love a real Stealth game
Chaos Theory was leagues better than the original and Pandora Tomorrow, adding a sound meter to help refine the detection mechanics just a bit more and upgrading the Pistol to have a small EMP on the underside to deal with lights and bullet-proof cameras
The AI enhancements are considered a mixed bag some love the small refinements others seem to detest the updated mechanics, saying that an slightly ajar door to a bathroom doesn't warrant an investigation.
The removal of the 3 alarm rule is great, allowing for the mission to feel less like a game and more like a real mission.

(P.S.)
get the widescreen patch unless you want to play without widescreen support.