While gamers may be quick to dismiss Nitro as a shallow racer aimed at casual gamers, it's actually fairly difficult, and gamers looking to totally complete the game will have a decent challenge facing them. Unfortunately, the "shallow" moniker does apply in some respects, as the single-player Career mode is quite brief and represents the bulk of the game; plus, the absence of online play does nothing to help this.
Given the slim pickings for racing fans on the Wii, though, it's easy to recommend NFS: Nitro, as it brings a solid (if however spartan) arcade racing experience to a system that clearly should have had one a long time ago.