Almost drop it after the first 5 minutes... didn't do it, and now I think is one of the most enjoyable games on the PSP!
First of all, the "drive, chase, shoot" games are not my kind of games... I like something where the story is a key issue and the characters have some personality.
So, when I get my hands on this game (a gift from a friend) I played for about 5 minutes and I was tempted to drop it and never look back. Somehow I ended up playing for another half an hour and the missions got interesting... the characters got funny and the story... well... it got some twists on it... believe me.
All and all, I think this is a really good game for the PSP. It has just the right combination of "button smashing" action, story and challenge to make it funny and interesting to play.
So my advice is: PLAY IT!.. even if you are not a big fan of this type of games, you'll like it. I'm a Ghost Recon fan and this game even have a Sniper-like part... ;)