GTA: Liberty City Stories is fun at first, but becomes completely boring once you have finished all the main missions.
The graphics in the game look good on the PSP, the edges are smooth and the textures are great, but they are ruined by the blurs and trails that the PSP's slow responding screen gives. The sound in the game is very average, there are only around 5-6 songs on each radio station and most of them are no-name songs that all sound the same. Although, the speeches and weapon sounds are great.
GTA: Liberty City Stories is a fun game, until you have finished the main missions then it becomes a total letdown. I would only suggest buying this game if you liked the previous GTA games, otherwise I would recommend investing in another game.