The Wind Waker was a fabulous game. It carried the already well established Zelda series over to Nintendo's new console of the time, the Gamecube. It was a classic Zelda experience, but at the same time, it wasn't too much of a carbon copy of any of the other games in the series. Sure, there were some similar things, but for the most of it, the game was new and creative. No, the cel-shaded toon-graphics weren't the only new thing, although, that is what sticks in people's minds.
It would not be too far from accurate to say that there is about a 50-50 split between those who were pleased with the toon graphics, and those who weren't. Regardless of your view, Nintendo did take a gamble in going down the path of cel-shading, and it goes without saying, that the gamble was worth it. But as it is now almost seven years later, we must wonder, what happened? Nintendo brought something new to console Zelda, yet we haven't seen it since.