Naruto's a solid character to use in Ranked Battle, but I don't see many people using in their main team still.

He is a good combo starter, but as people have said above, GNW Kankuro does it better. Also, his lack of a chase really is a detriment. Combo starting is important, but you'll find that a good amount of your damage is done by mysteries and combos themselves and mysteries are the best way to guarantee a combo start.

Naruto's clones are pretty fragile and it's not as easy to pull of a rasenshuriken as one would think, as usually, Naruto is left with 1 clone still alive.