Reducing an epic library like the ps2's down to 5 favorites is blasphemy!
I like blasphemy....
Persona 3
Shadow of the Colossus
GTA San Andreas
Metal Gear Solid 2
Dynasty Warriors 4
Honorably Mentioning Even More Blasphemy:
Valkyrie Profile 2
Katamari Damacy
NBA Street 2
Ace Combat 4
Need For Speed Underground
Def Jam: Fight for NY
Sad thing is I still need to get most of these titles