Mildly entertaining.

The graphics are somewhat underwhelming for a game that came out this year, but the core gameplay is fun. However, the game lacks overall polish; there are no sound effects when you go over a boost pad, or get blown up. Also, the game doesnt support retina display or multitasking. I really hope an iOS4 optimization update is in the works. The homescreen icon looks especially muddy. There is also no way to rotate the screen 180 degrees to make play with headphones more comfortable.
All in all, Im glad I got it for $0.99, because in its current state it is NOT worth $4.99.

Tyson064 about Crash Bandicoot Nitro Kart 2