you tried what. you know that Mario kart 7 has wii tracks on it don't you? all wii stages on the 3ds look better than on the wii do you want me to show you images?
No they don't. You must be new to the model importing scene. One, the texture sizes are lower. Two, the polygons are far less than that of Wii's, and the lighting engine is not as advanced. You can make a MUCH better argument if you compared MKDD to MKWii's differences.
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Scratch most of what was said above by me. This man has a point we've all been ignorant to about the 3D option and its effects. ^