This game just rocks. I can't count how many times I played the Gamecube version, and frankly, the PC version's controls make for an even better experience.
While definitely not for everyone, this game is for those of you who love having a variety of ways to take out your opponents or progress through a level. I still find new and undiscovered paths and methods of progression through the levels that make this game a rich and highly replayable experience.
You get a bunch of different gadgets and maneuvers at your disposal, and you get a few different choices of gear for every level. You get to sneak around and knife, strangle, knock out or shoot unsuspecting guards while dressed as a modern-day tech ninja. Come on. How cool is that?
You will die. A LOT. This is partially due to the fact that the coding is far from perfect, leading, on rare occasions, to frustrating deaths and errors that shouldn't have happened. I forgive this, however, as the game's AI is actually quite forgiving, and the game itself is pretty old. But this game is also just (relatively) hard, has a decent learning curve, and requires patience and observation skills.
The story doesn't really make any godamn sense, but that just adds to the fun. The voice acting is pretty good, and the radio communications between Sam Fisher (the main character) and his superiors are often amusing, if not just dryly stupid.
The art, music and sounds in this game are just top-notch. The game really excels in the aesthetics department. Tons of shadows, and enough suspense to make a weaker man crap his pants in fear.
There's a lot of content in this game, and your first play-through will probably take you well over a few dozen hours to complete. Admittedly, it can be difficult at times to figure out how to progress to the next part of the level, and the in-game map is, well, absolutely the worst game map I've ever seen. There is also no auto-save, which means you have to stop to save frequently if you want to save yourself the trouble of replaying the same part of a mission over and over again.
But if you can overlook the game's few anomalies, then you're in for one hell of a treat. Turn the lights out, grab your favorite drink, maybe have a smoke, and enjoy probably the greatest and most innovative third/first-person stealth shooter ever made.
If you don't get a kill boner while playing this game, then this is not the game for you.