This really is a great review, EmP, one of your most readable and informative to date. So I'll point out this sentence, which is a bit of a wreck: "As such, you can find yourself spending a lot of the game eating dirt, or being fling off cliffs, so it’s to the game’s credit that, even in the higher rated races, so do a lot of the other quad racers." If you fix that and the comma splice that kicks off the last paragraph, that'll take care of any overwhelming grammatical concerns I had. If I ever review this game (I have the PS3 version, but haven't yet cracked open the seal), I'm sure I'll take a different approach... but I liked yours here, too. Great stuff!
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world