Rockstar is the grand daddy of free roaming games, and this just adds to a list of already incredible games.
The mission structure to the game is similar to grand theft auto, but without cars, it is such a pain in the neck to get around everywhere. but still, the missions follow the story, are pretty fun, and everyone is very different. I personally thought that the game was too short. until i looked at the playing time on my save file and it said 16 hours to complete the game. i was truly so hooked to it that I wasnt really paying attention to how long i was playing this game. it took me about two days to finish.
After you finish the game, there is this endless summer thing. really, unless you are a completist, you shouldnt really bother. its just looking for rubber bands and all that crap. there are some bike races and carnival games, but its not going to hold you playing for that long.
the graphics, like grand theft auto's, are not great. because it is a open world, your going to see a lot of blur and textures that really shouldnt be this bad. the cutscene character faces look pretty good, but thats saying a lot.
Overall, I would highly recommend this game to anyfan of grand theft auto or any action adventure games, because it is among the best of the ps2s collection.