Other thoughts:
Matt W: There are only a few slight problems with the game that I can think of so I will place those here. First, sometimes you go off the track for no reason when going too fast. This could be due to invisible barriers or something, but I'm still not entirely sure why. Next, sometimes you can end up driving sideways (and be performing decently) when the game will randomly decide to respawn you. During our multiplayer session, the fellow who was always wrecking us started really losing during one race, which I thought was weird. He said that he got stuck on some part of the level and the game wouldn't let him respawn. Normally when you get stuck in an area that you can't drive out of you can press the B button to respawn and be placed back onto the track. He said that after a certain amount of time passed the game finally auto-respawned him but I thought that was weird. Also, this might be due to the amount of players or the online aspect, but respawning during multiplayer takes significantly more time than during single player.
GamerX: To be honest, I personally believe the game is too fast in some portions. And as Matt W. mentioned above, there are some very ill designed parts on some of the maps that will make you pull your hair out. This dropped my score down a bit for the game because I could almost taste victory sometimes only to die, re spawn, and die right away again three to four times in a row. This wasn't so bad in single player as it was online, however when you are playing to win it really does frustrate you. (to the point where in some matches I just gave up as Matt or Aubrey were already like 50 seconds ahead of me.) It is fun however, don't get me wrong. As a non-racing fan I found nail'd to be a very enjoyable experience. http://naildbiter.com/drkSq