Just go buy it. You're missing out on the second best game on PS2.
1) God of War II
2) Shadow of The Colossus
3) GTA: San Andreas
4) GTA: Vice City
5) God of War
6) Metal Gear Solid 3: Snake Eater
7) Resident Evil 4
8) GTA3
9) Ratchet and Clank: Up Your Arsenal
10) The Godfather
Haven't played ICO, hate racing games and am not a fan of JRPGs. Note that I do not own all of these games, but have played them all.
EDIT: As for PS3, MGS4 is slightly better, and SoTC is about equal with BioShock.