Portable gaming is pretty crappy in general.
It's been pretty hard to find something worth playing on the DS even after not having owned one for two years. The only games that I really like on it are the Castlevania games and New Super Mario. Everything else is ruined by the DS's N64 graphics.
PSP is not much better. While its 3D capabilities are great, the nub is the worst analog stick ever and the screen on the PSP-2000 has terrible ghosting and is unwatchable in bright places. Most importantly, all the games just seem like inferior versions of games that I can play on consoles and PC.
So, yeah, what Himu said was dum.