If you have a PS2...get it. I have never been so impressed with the story behind a game, or everything that went into it. Hell, I'm willing to make Hideo Kojima an honorary God for this game alone.
The ending, especially...the storyline, the twists, the double-backs, the mind games...fucking WOW.
Gonna try and sleep now. Intended to do that a couple hours ago, but obviously didn't make it...