I loved my PSP and the homebrew scene during that era. The biggest area where the PSP felt like it was lacking was with multiplayer games. I remember playing some fighting and puzzle games with friends on the PSP, but the most fun wireless multiplayer experiences were on the DS; and primarily it was Mario Kart DS. The real killer feature was being able to play with friends without requiring them to own the game; I don't think PSP games were capable of this.