#1, have you even played it?
#2, have you seen these direct comparisons?
Hauted tracks for...
Wii:

DD:

Highways:


And the best comparison, Bowser's Castle:


Is there anyone who can look at those screens and seriously tell me there is no difference, or even that DD looks better?!? The Bowser's Castle shot is the most telling of the difference between the two.
To me, the lighting, color, poly count, scenery, and characters all look significantly better. That's not to say that it's pusing the limits of the Wii by any stretch, it wasn't designed to, but it is a marked improvement.
Source: http://www.gamespot.com/features/6189887/p-3.html









