The first basketball game I played on the PS3 turned out to be unimpressive. It pleases the sought-for basketball feel to a basketball game but it just can't compare with the greatness of other games in its Genre like NBA 2K or even Live.
The graphics are better than the PS2 version and are above average. The storyline places you to become the "star" of an NBA team but there's not much variety in it. I gave the game a 4 in Maturity Rating as it is very easy to master the controls as well as the game's "Shot Meter". It actually took me one quarter to master the shot itself!
Overall, the PS3 version isn't that much better than the PS2 version. However, if you want the better experience, go for the PS3 version.