well there have been quite an few reviews on Air Gear as it is but i felt that although the anime is awesome as it is soo much more could have been done with it i personally think that more amount of cooler air tricks , sparking and super spinning wheels , riding fast in the corners to up-skirt girls and a lot more if this kind of stuff would have made it truly a master piece .
Also at the end you get a feeling that " what ! ended already " as in it could have been awesome if ikki got to fight with all the king and if kazou had a few of his super speed races etc .... the possibilities seem endless .
All this dosn't change the fact that it is an awesome anime and one of my Favorites it has spunk and onigiri was fantastic all the way . i would recommend it for those people who love speed spunk and super hot chicks .