Pretty good.

Its really fun, but a few adjustments would make it better.
1.Having unlockable vehicles, characters and tracks would be great!
2.A career mode
3.Make accelerometer automatic
4.Make the main screen look never and more organized!

Other than those things, I like the tracks and like the difficulty aswell as multiplayer via GameCenter. Not worth $3.99, if your looking something more worth it get Crash Badicoot Nitro Kart Racing 2 for $4.99.

G. Zinck about Cro-Mag Rally, v2.3