Racing games bore me, but I bought this title to have a racing game for the XBOX, and it has gave me interest in the genre. The reason being that it combines the aspects that make Tony Hawk so interesting...pulling off tricks and combos. Incredible graphics, realistic sound, and (as mentioned above) a fun factor that's through the roof.
With many game play modes (time trials, trick levels, many forms or racing), all of which contribute to your total Kudos points to unlock more cars (and the more you use a specfic car, you get to unlock paint jobs and helmets), there is plenty of replay value to be had here. IMHO, this game is far from repetitive.
The only thing this game is missing is the ability to tune and upgrade cars.
I have to admit, I used the Nosliw code to unlock the Ferrari F50 though :)