For the original Perfect Dark fans: The goofy stiff animations which include rolling, shooting behind while facing forward, wide stiff gestures for miming story, and no facial animation is still present. It was more endearing than detracting from the experience. Also, the original music is intact - but is now present in stereo.
The gameplay resembles an N64 era shooter, wandering aimlessly to memorize rather short levels to complete objectives. You'll pick up a load of neat weapons that have cool alternate fire modes for maximum damage (well, okay, some of the guns have "pistol whip" as their alternate fire mode).