I know it has it's issues and needs some tweaking to get running right but underneath that noise is a great game, the level design is top notch and the gun play is just awesome.
Movement ability is really great too, it's like you are playing on ice, it feels so smooth and supple.
Graphically it's alright, but it has it's moments where it can look rather amazing, the technology that uses 1 texture for the entire world is unmatched in giving a very seamless representation, however there are issues with it as i stated before that the game needs tweaks.
I am replaying it on Hard, and oh hell is the challenge higher, Nightmare mode is unlockable once i beat it on hard, i completed this game for the first time 3 years ago, the images are from 3 years ago.