I've found that if you don't like sailing around and exploring the map, then you won't Like the triforce fetch quest.
I disagree with this because I LOVE sailing around, but I did not like the Triforce fetch quest. (Alot of times I'd sail to a place rather than warp there simply because I could) I don't necessarily think its bad for the game, but I simply didn't like it. Sailing around looking for specific items is fine, in fact, its fun! But when you make someone sail around for items, and then FORCE them to pay a huge amount to be told they have to sail around for other items, THAT made it less enjoyable for me. The fact that I had to sail around TWICE made the quest less like a video-game adventure where you're rewarded for your immediate works, and more like a real life quest where the reward sometimes doesn't seem like its worth the work (which I don't like).
Also, I think if you're going need to sail around alot for things, it should be for something you don't have to get. I've found that not everyone likes the same things about Zelda games. Hence why side quests are SIDE quests, that way if you don't enjoy that part of the game, you won't have to do it. This goes to the rupee thing people mentioned. I've always considered rupees in Zelda a privilege, not a right. They are there for the more serious Zelda fans who are trying to get more into the game than just those who are playing Zelda for the first time. Thus, if you force people to use rupees, you force them to enjoy Zelda in a way they may not want to which is what turns a lot of people into Zelda haters.
One thing that I'm not sure if its bad or good but mainly I just wanted to point it out. Searching for the triforce takes away from the "destiny" theme that Zelda has going on. Someone mentioned that its much more rewarding when you earn the triforce instead of just being given it. While that may be true for a lot, Zelda tends to give Link the triforce because it is his destiny to be the hero, and thus his destiny to wield the triforce. In WW though, you must earn the triforce and thus earn your title to be the hero. But like I said, this isn't necessarily a bad thing because I think Nintendo was actually trying to stray away a smidgen from the "destiny" theme in WW and more towards the "earning the right" theme as demonstrated when getting the Master Sword didn't mean automatically getting the power of the Master Sword. (Another example is that TP which I believe was the opposite of WW was heavily reliant on destiny).
All in all, my opinion is that if it hadn't been mandatory, I would have enjoyed it more. Still, this didn't really ruin the game for me. I still love WW.