Gamespot had the following games listed for the PS2 and the last
did did much better as PSP games:
Ratchet & Clank November 4 2002 Gamespot 9.0
Ratchet & Clank: Going Commando November 11 2003 Gamespot
8.8
Ratchet & Clank: Up Your Arsenal November 3 2004 Gamespot
8.7
Ratchet: Deadlocked October 25 2005 Gamespot 8.6
Ratchet & Clank: Size Matters March 8 2008 Gamespot 6.0 PSP
8.2
Secret Agent Clank May 26 2009 Gamespot no rating PSP 8.0
Links to Gamespot information on these games has been added
under the related links