There are a lot of great things about The Wind Waker. It truly is a great game, and is, in fact, my third favorite Zelda game on my list. The Wind Waker was a very enjoyable game, and is definitely one that I wouldn't bother replaying a few times. I think that the sailing could have used some work, but it was pretty good. Some of the high points were things like the graphics. Honestly, the graphics don't matter that much, but I feel that they didn't go completely wrong with the graphics style of The Wind Waker, which is what makes it more of a high point.
Another high point could be the dungeons. The dungeons in The Wind Waker were very appealing. A lot of them were pretty simple, in my opinion, but that's fine. They were still enjoyable, and that's what we really need in a Zelda game. You can take all of the aspects of a game and sum them up, but what it really comes down to is whether it was enjoyable or not. That's what makes it a high point or not, a good game or a dud. The dungeons in The Wind Waker were fantastically enjoyable, boss and all.
The Great Sea idea was a very good idea, and added a completely new feel - one that I really enjoyed - to the game. It isn't something that's been used before, which is what made it so great. It was unique, and it was put into the game rather well. Sailing aside, the Great Sea was a perfect idea. The complete renovation of Hyrule was absolutely brilliant. The whole world was very appealing, and the game was fun to go through when you sometimes felt that sense of adventure when sailing on the sea. If I sat here and thought up a storm, I could probably list quite a few more things. The game was absolutely amazing.