Go to your local game store and pick this up:
It's Metal Gear Solid 1,2 and 3 and all are playable from the PS2 system. You'll need a PS1 memory card for MGS1 though.
The series is extremely in depth, bad ***, emotional, intriguing, and just about any other positive word you can think of for something. The story line just pulls you in to the point of where it's pretty difficult to put the controller down. The game play gets better with each game because times change and so do the abilities of the games.
If you pick this up, when you get the chance to play Metal Gear Solid 4 after you beat the first three, then I recommend playing that game as well because it finishes the series. Also if you do pick this up and you like it, if you can find or get a hold of Metal Gear Solid: VR Mission for PS1, it's a fun/interesting play for hours.