It says its gonna show us what true speed is... It does all that and more.
The gameplay is fast. BLAZING fast. The first time I played it I got dizzy after just one lap around Metal City! Its got all the speed a Sonic game should have and more.
For the first time since Sonic 3 came out on Genesis, Jun Senoue didn't have anything to do with the soundtrack. Though I do miss Jun's blazing guitar riffs and the amazing music of Crush 40, the other soundteam members and a band called Rumblebee carry the torch quite well. I will warn you, if you don't like techno, have the headphones ready, but even the most jaded music fans should appreciate the music in this game.
The downsides are the difficulty of the story mode levels... Ok just the Babylon Garden level, and there's no sound whatsoever in the CG cutscenes, but its a great game that no Hedgehog or racing fan should miss.