There aren't really all that many great PSP games.

My recommendations:
  • Every Extend Extra
  • Gitaroo Man Lives
  • Hot Shots Golf: Open Tee
  • LocoRoco
  • Lumines
  • Lumines 2
  • Me & My Katamari
  • Metal Gear AC!D
  • Metal Gear AC!D2
  • Metal Gear Solid: Portable Ops
  • Valkyrie Profile:Lenneth
  • WTF: Work Time Fun