Wind Waker's image was ruined when the first screenshot was released. I still consider it one of the best in the series (though except for the DS titles, the CD-i games and by your argument Twilight Princess, there's never been a Zelda title that wasn't amazing).
Despite that, the Zelda games are visually perfect in whatever style they use, and it'd be interesting to see what they could do with the wii hardware on a new cel shaded adventure.
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