A friend let me borrow the game and I was amazed.  I requires a heck of a lot of strategy.  I am still waiting for a game like this for my PS2.  This is the only game that got me away from play Madden 2001.  Basically you go threw a bunch of missions so you can destroy metal gear, which is a nuclear weapon.  The game not only includes killing and adventure, but also tries to teach you about the nuclear weapons and power.  I think getting this game for ... is a steal.  If you have never played it definitely buy it and play it on normal or hard mode.  It will waste the adventure to play it on easy.  It took me around a month to beat, playing it about 2 hours a day.  Only negative is that there is a lot of talking in the game.