Tips : Download 'Plutonium' for multiplayer experience. And keep it in mind, because it's a third party software, take it on your own risk.
Testimony : this game save myself from porn addiction in my teenager years.

Personally i think this game is better than Call of Duty 4. The lack of villain in this game made us focus on the war itself rather than plot. With gruesome detail everywhere, creepy ambience noise, and low frequency whisper "die" everytime you die made this game more scary than it was meant to be.
Mute protagonist that start out as a rookie and end up as a hero is fascinating and it's feel real.