I love GTA3. I love the music (which if I get sick of one station\'s music, I can simply turn to another station), I also love the veriety of missions. Granted, they all invovled either stealing cars or killing people, but even then, each mission is still unique. Also, some are pretty open ended on how you can finish the mission (like you can either try to snipe some dude from a distance or blow up his car once he tries to make his escape). Along with extra missions like taxi, vigilanty mode (playing as the cop), fire fighting, or even paramedic missions, just so much you can do in the game.
Now, best PS2 game...haven\'t played enough PS2 games to say that, but it certainly is up there.