I got it, played it for a day and was bored of it :\
It's not terrible, but it's just a rehash with a few new characters for another $60. Basically all the old characters are the same (the '2nd' super for most is just some useless air super that doesn't even look cool), the mission mode is pretty lame and the gameplay is pretty much unchanged.
The best thing I can say about it, is that the new characters are actually pretty unique and fun to play as instead of just being by the book characters. Shino can create good traps with the bugs, and Chouji is like the Zangeif of the game. Temari's long range but strong style is pretty good too.
New stages are good too, it's just too bad they are so few.
Still, having to start from scratch with like 10 characters and play through the game for hours and hours and hours to earn enough money to unlock everyone AGAIN is pretty lame and with all the good games out at the moment, I'm just not willing to spend the time with it. I think it's pretty retarded to add 9 characters (the whole reason for buying the game if you have 1 or 2) and then only give you 1 off the start and make a few of the 9 extremely expensive so it'll be a while until you actually get them.
Lastly, the character roster is just weak. A lot of new characters have been introduced in the anime storyline and fought since GNT2 and should've been added (Kabuto, Kisame, etc..) but instead they only added the major ones that for the most part could've been in GNT2. It's too bad Narutomite Hero 2 has such broken gameplay (near-infinite Kawarimi fucks it IMO) because the roster and supers of that game completely destroy GNT3 IMHO.
PS. Good job putting a guard breaker in there, but it takes way too long to break their guard. When Itachi can block for 10-20 secs straight without having his guard broken then there's not much point.
In GNT4 I want auto-block OFF option, quicker guard break, HI/LOW blocking and fix the 'back turned, you're screwed" issue. I like how they handle Kawarimi in this series and the supers are pretty balanced. They just need a few more steps to turn it into a 'real' fighting game, but as it is I think it will continue just being a light party game.
3x3 is pointless too >_<