ok... this game... is freaking amazing. read on ninjas
Graphics - i gave them a 10. the gameplay is really smooth even when 4 people are on screen, and everyone is cel shaded pretty nicely. the only time there is lag in-game is when u have like kankuro fighting in a 4 vs match. and then have naruto use kagebunshin no jutsu while kiba is also fighting. thats probably the only time you'll get lag.
Sound - 9. though it gets kind of hectic, and u cant really hear just one thing, the sound has really good quality. the only thing that gets me, are the stages that have calm music to such high intense fighting.
Gameplay - 10. what starts off as a button masher turns into stragetized, combo linking-ending-with-a-special, warping, dodging, countering, free for all between 4 ninja session. once u get a character that you like, and learn their combos, and ninjutsu skills, it wont appear to be such a button smasher anymore.
Overall - GET IT, even if u cant read japanese, go online and find a main menu translation guide, and mission guide. you will have fun... u will REALLY have fun if u enjoyed the first one.