Looking at the records this game has made you would think that everyone would know about this but in reality very few people don't even realise it exists at all.
The problem lies in the fact that it isn't really a racing game. All you do is drive around a ridiculous looking track to gain the fastest time or you drive around a ridiculous looking track and try and stay on it. No actual racing, no A.I to race with or any satifaction of winning.
Now I'm not sure if this is the DS issues or the game itself but at various points while racing I would suddenly fall through the track and I don't mean the holes on the desert circuits, I actually mean I fall through the solid circuit so the game is very buggy as well.
One thing I will say though. The game is really addictive so you'll spend various hours on this until the DS battery dies.