A good game and if you like 4-wheelers you may think its great.
The biggest problem for me is that I am just not a big 4-wheel racing fan. I enjoy some car racing games but one of the thrills of most racing games is the looks and sounds of an awesome new car or part you unlock. However the only thrill of unlocking something new on this game for me is the tracks and race series. Because I know little about the genres all of the 4 wheelers look the same except some minor color changes.
If you enjoy off road racing then I would be willing to bet you would enjoy the game. Even if you are not a fan of it the game would probably be worth checking out if you get a chance. It is a good game to be packed in because it is a solid game that allows you to try a genre that most wouldn't try otherwise.