MXGP The Official Motocross Videogame offers a good game based on Motocross' World Championship license without big boasts, it brings a good experience for those who like this sport, but it's not aimed for the common gamer.
MXGP is a surprisingly intense racing game, thanks to the almost superhuman levels of concentration demanded in order to succeed. It's rough around the edges but good fun once you get to grips with its unique racing style.
Milestone have delivered a fun and different racer that uses rider momentum in an interesting way. However your enjoyment and, probably, the longevity of the game will depend on your interest in the sport or the racing game genre.
Developer Milestone completely lost sight of the show elements of motocross, which makes MXGP feel kind of lame. A shame, because we're really itching for a new good motocross game.