its not that bad,
The Good: Its good for a long journey or your camping out somewhere then its really useful, Memory Stick Duo, Screen Size is the best ever on a handheld, Lightweight, Built in Wifi, Excellent choice for portable gaming
The bad: Graphics Lack to the PS2, Battery life isnt The best, Screen is let down as you cant see it in summer time if you want to go outside and play it, The Sony PSP's multimedia functionality is underwhelming, especially for video, requiring expensive memory cards. The load times on the UMD games can be excessive.
I think its worth buying one if your bored atleast you have something else to play on