Another addition is the video hint system, which can provide clues if you're stuck on a certain fight or puzzle. You can view these videos through interacting with a statue in game, or look at them when Link dies. The system works well enough, and it's a concession to players who may not have so many latent memories of how they made Darunia the Goron dance with a certain song played on the ocarina.
The Master Quest is the answer the designers came up with to reward replay. Back in the old school 8 bit Legend of Zelda, the second quest was another way to play through the game at a higher difficulty and new locations. The Master Quest of 3D Ocarina of Time is the same idea, with the world mirrored so that what was left is now right. That's enough to obfuscate most puzzles all over again, but it's not like a brand new design or anything. On top of that, all enemies hit twice as hard, which is a nice boost in difficulty. If Z-targeting didn't hurt my hand, I would have totally killed that Moblin and the added difficult might have been more welcome.
It is nice not having to hit the start menu every time you want to switch items or check out the map, with all of that functionality now handled by the touchscreen. On the other hand, you are forced to move your hands off the controls on the sides to access that stuff, so it's not gobs more convenient. I also liked being able to aim my slingshot by moving the system itself, the accelerometers taking care of the fine-tune controls. I didn't even care that such movement messed up the 3D image.
Ocarina of Time is an excellent game. I was reminded of that fact the entire time I spent playing it on the 3DS. But I couldn't help wishing I could play Miyamoto's masterpiece as it was meant to be played: on a big screen with a more comfortable controller. The 3D graphics and UI improvements were not enough to offset my frustrations playing the game on a smaller scale without adequate controls.
Bottom Line: Everything that made Ocarina of Time one of the greatest games ever is still in the 3D version, but all it does is make you reminisce for a simpler time and a better controller.
Recommendation: If you are a diehard Zelda fan and used to handheld controls, 3D Ocarina of Time is worth it. If not, you might want to wait for a reissue on a bigger console.