It can be really boring after level 10, you race your *** off for money, you dont have sponsors, you have to work for your every cent in the game, whitch is a nice idea, but takes forever to gather the money and build a race HQ or any stage2 building. Clearly the aim of the game was to make you addicted, so you would buy CM points to develop your team faster, but I dont know what will happen if you reach the end of the developement line.
The best thing in the game is time trials, there are no stupid kids to ramm you off the track, but you can still compete with other guys around the world.
The biggest problem is, you cant really achieve anything with the game, you cant have the best team, as there is no clear point system, just the time trial leaderboard. If you have time and the connection speed, try the game. For me the project has been a big disappointment (so far).