This game will more than fulfill any Zelda fan's urge for adventure, despite its length.
When I started, I was disappointed about it being all touch-screen cause I had the urge to button-mash monsters to death, but the touch screen system is actually ingenius! Between the boss battles, dungeons and all those awesome tools like the grappling hook and hammer, it just feels like any other method would have been... awkward! Not only that, but I felt like it had just the right amount of difficulty. I followed a guide religiously because of my past failures, but I'm playing it again solo and it's just so much fun! It's definately built to be clever, that's for sure.
Not only that, but the characters and story are amazing. Link is adorable as ever, Ciela and Oshus are great additions and then there is Linebeck, who is possibly the best character of all time. The story also had moments (mostly Link-based) that just had me killing myself laughing XDD And the ending is so great that I've played through it tons of times already!
Bottom line, this game is definately one that any DS owner must check out, and for those who are pondering buying a DS just for this game, you definately should. It has tons of replay value and just overall awesomeness.