One of the best games ever!
The game is powered by one of the best game engines ever that allows you to destroy most walls in the game, which means that you can take out enemies by destroying a bridge, also the story is great, weapons are fantastic, and the graphics (for the time the game was released) are absolutely great, the sound is also great.
You can beat the single player campaign and go for the multiplayer wich is one of the best I have ever played, you never get tired of the single player campaign and the multiplayer, you can still play it again and again and again and again...
Even now in 2006 the Geo Mod technology seems impressive, I would say it is as revolutionary as Half-Life 2, if you want to play a great FPS go ahead an try this one, (PC or PS2, both versions are worth) I promise you won't be dissappointed, even people who are not fans of FPS games think this game is excellent.