As much as a enjoy the wii, that is just rubbish. The wii was designed differently, graphically it can look just as amazing artistically...however high rez and realistic bump mapping is just not going to happen on the Wii.
Even though the Wii still has not reached its full potential by any means, will only look slightly better than any of the best Xbox games, it will never be as crisp and clean as any of the Xbox 360 or PS3 games. On the other hand, that does not mean that it can never look aesthetically pleasing to the subjective eye. In my opinion Zelda looks better than many of the Xbox 360 or PS3 games, but not because the crispness of textures but the overall quality of the graphics and artistic representation.