Summary: When first playing this game I was impressed with the extras it offered. You can choose from a wide variety of characters, each with thier own unique skills and fighting style, and the audio and graphics aren't too bad either. The only majoy dissapointment I had with the game is entirely mini games. You can unlock cool abilities for each character and it can take a little stratagy to think of how or which character to use for each mission that you choose.
Summary: I'm a big Naruto fan, so I bought this when it was on sale. If you aren't a fan, don't bother. If you are a fan, pick it up when it hits the $10-15 range. The combat is pretty simple and gets old. The fun comes from collecting and playing as such a large group of characters. If you're favorite is missing...than your favorite is either too new or too obscure ;) In my opinion, the best Naruto game to be released in the US so far has been Ultimate Ninja 3 on the PS2.
Summary: Okay, first of all, this has no storyline. It's all about ranking up. You start off as a low-ranking ninja doing easy D-ranked missions and end as a Jonin doing S-Rank missions. If you don't mind that, then this game is pretty good. As another reviewer said, I like how each character has their own qualities. Lee is faster than Choji, and I believe other characters can jump higher than others (say, Kakashi and Naruto).