obv the gta games..

besides that I think theres a metal slug collection released for ps2, get that. Oh and ico, best puzzle game that Ive ever played. Its last on my short list and Im too lazy to cut/paste it, but its def the first one you should grab. I thought this was one of the coolest most original games at the time. I might have to see if my ps2 still works and go find a copy of ico.