Motocross should be ashamed.
I put in a decent chunk of time to play. You start out with 2 bikes, and 2 ATV's. You also get a small portion of tracks.
Now, maybe I am an idiot, but I raced everything on the two tracks, and got gold medals, but I didn't unlock new tracks. It seems like you have to grind out races at the same tracks even after you win them to unlock new tracks. There is really no, "career mode" which really tanks this game.
The physics aren't good, but they're decent enough to play. But the fact that you can only sample a small portion at the start means this game has NO content to me and they made it longer by forcing you to grind your rider levels. Huge fail in my opinion. With so many other racing titles, having to do this, even if it's motocross, makes me not want to play it. Glad I didn't buy it - a party game at best, but even then, you won't convince people to put down Rock Band or Guitar Hero to battle it out on this title.