It had the second best song in the Zelda series. Dragon Roost Island. Even Ganondorf loves that song. If you don't love that song, then you can
not be human. The soundtrack was
amazing.
The exploration was also something that was done incredibly well. Going to islands and thinking "Darn, I think I need some other item to do this" and just the fact of filling out your map was awesome.
It also handled the story and Ganondorf very well. In WW, it wasn't like "This is Link, the hero of the world" it's like "This is a boy named Link, with no connection to the Hero of Time" and I just liked it very much that "This is just a random boy with heroic traits". I just loved how they handled that. And they way they handled the backstory was just amazing. WW has, by far, the most interesting and amazing BS in the entire series. Even the way they handled Hyrule was done flawlessly.
Ganondorf in that game was by far my favorite appearance of him. He kept most of the traits that make him the most epic chilling villain in the series and there was something wrong about him from OoT that was corrected: he was humanized. After all, he's a power hungry guy. Sure, he does seem demonic but he was actually given motives (just look at his monologue near the end of the game).
Also, they did the graphics very well too. They were just superb and they're by far my favorite style in Zelda
ever. Seriously, you'd be nuts not to think that they're incredible graphics. Sure, they may not be some peoples' favorites, but to say they're bad is just plain biased. How could you not see the improvement from OoT to WW?! Seriously, look at the comparison of the two Links.
To say WW graphics were a downstep from OoT is just being plain friggin biased.