It's everything it's hyped up to be and more. I say this because it is a jutsu most likely created by the SOSP, handed down to the Bijuu's. It's power can be weak or strong depending on ones chakra levels, and when Naruto figured out how to add wind chakra to it, Rasengan became even more deadly. They stated Rasenshuriken is a jutsu that can stop you from using jutsu forever if hit by it. So with that said I wonder what would happen if you added other chakra types to it. Fire, lightening, earth, or water should have their own special effects on it's victim. It's also amazing because it was basically copied via Minato without using the Sharingan which by the way can't copy it, that's just amazing in itself. Mastering a jutsu created by the SOSP also speaks for itself, because if the sage saw it fit to be the Bijuu's main offense it has to be beasty.