The defenitive MGS experience on PS2, not only do you get the main game with the Portable Ops camera (which helps ALOT). You get perfect translations and ports of Metal Gear and Metal Gear 2: Solid Snake.. which ironically have Big Boss as the atagonist rather than the protangonist like in MGS3.
Sadly, online mode is down now. If you can find this game at a reasonable price, pick it up. It's rare.