This is a joke, right?
The controls are absolutely intolerable, being both unresponsive and uncomfortable (Arrow keys and O+P? You must have a weird keyboard if you thought that was a comfortable position.), it's buggy as hell, and there were some generally terrible decisions made in regards to movesets and balancing. It's hardly even playable.
The only reason this is so highly rated is because of the massive fanboy overload, the waves of people who see that they can have Naruto fight Cloud and instantly give one of the two ratings they have the mental capacity to distribute: a ten. (The other being a one.)
I really have to question the logic of the character roster: Sonic I can understand, Naruto, well, that's cringe worthy, Mr. Incredible, I suppose you could plead insanity, but the addition of not one, but two half assed Sonic fan characters? No. Just no.
I suppose I can expect all sorts of "this review was not helpful" responses for this simply because I didn't like the game. It's to be expected.
In conclusion: 10 points for concept, but minus a million or so for execution.