@OP
I'm sorry, but those comparisions are an incredible stretch.
The reasons I didn't care for Wind Waker, personally, were:
I just didn't care for the art style. Never have, never will.
The overall game story just wasn't as compelling or interesting (to me) as most other Zelda games.
And lastly, yes, the sailing did get boring as fuck.
Even knowing VERY little about Zelda U, it looks to have NONE of that. I love huge worlds, and I love exploring. WW did not have a huge world, nor did it have all that much worthwhile exploring. It had a LOT of water, and it had a LOT of sailing, and it featured a sprinkle of islands that, for the most part, weren't that interesting to explore.
This world, by contrast, looks lush and awesome. I would be all for a part (or parts) of Zelda U's world, that feature some boat action, like a nice coastal region, perhaps a big lake, etc. I'm totally down with SOME boat action and water, for sure. Just not that making up most of the damn game. The Zelda U world, even what tiny bit we've seen of it, which is NOT going to be what the whole game world looks like, looks amazing. They showed us ONE area of the game, that is mostly grassland with some small forests. There are no doubt going to be other, very different parts of this Hyrule, that feature vastle different terrain, such as mountains, snow/ice, dessert, coastal regions (hopefully), a volcanic "Mt. Doom" type area, a much more dense/bigger forest area, etc.
Who knows. But the entire game certainly isn't just going to be a "grass ocean". And this won't be anything at all like Wind Waker, which, in spite of appearances, was honestly one of the more linear Zeldas. This game promises to possibly be the LEAST linear since the original. And that's a-ok by me.
So in short, I really didn't like WW. But barring any incredibly silly, tacked on gimmick BS, I'm sure I will at least like, if not love this game.