The Ratchet & Clank games are in my opinion (on the PS2) Best of all time. The mixture of Jump`n`Run and Shooter is Insomniac Games has succeeded perfectly. Ratchet and Clank 3 Likes better than its predecessor. But there are all 4 good games.
Conclusion: If you do not have these (s) play (s) then did you buy the PS2 in vain.