Through all I'm concerned, the games that make the PSPgo worth it are Daxter, Ratcet and Clank, God of War, Patapon, and FF VII.
Realistically, there is far too much fud for the PSP.
PS: I prefer the go. I used the 16GB main memory for games, and 8GB for music.
The PSP needs a dramatic overhaul though. A second analog, smoother controls, and better games. I stopped using my PSP and just replaced it with a MP3 player with better battery life.