One of the best arcade racers you can play. First of all it looks great on Wii. The controls are simple, but not watered down (also worked great with the Wii wheel). The courses are fill with things to do like flying through rings, running through trees or deforming the whole road. The multiplayer was fantastic (sadly no online) and you could use custom soundtrack.
This and Motorstorm: Pacific Rift were the kings of racers of the seventh generation.