In terms of in game physics, the game is spot on. Your cars can knock things over and push them out of the way. The graphics are good, and the track layouts well thought out.
Unfortunately, the game is completely unplayable due to the awful control system. In order to turn the car you twist the remote about it's long axis, and this is really hard to get right. It's so difficult that even with a few hours practice I was still unable to control the car with any degree of accuracy, and I consider myself quite good at computer games with a wide variety of control systems.
Wait for version two when Popcorn have figured out how to use the Wii-Mote correctly. FIFA 08 was shocking to control, but 09 got it right. Hopefully, Popcorn will do the same.