I didn't have a N64, so I never knew what was to play Ocarina of Time, and I was very glad to know that I could experience it in a 3DS.
The Legend of Zelda: Ocarina of Time 3D makes you feel part of a big adventure and quest, makes you feel part of Hyrule, like few games can do to you. Graphicaly, the game is great, but this is not something I usually pay atention. But the soundtrack... oh man, AWESOME. It's hard nowadays to play a game that has an OST that remarks you, but here, every town, every dungeon, has a song that you will be remembering, even long after you beat the game. The controls... well, Ocarina was a revolution in it's time becaus of this, so I don't have much to add here. Finally, the 3D effect is pretty cool, but when you are in a hurry, or desperate fighting a boss (and you will), the effect makes things harder for you.
This an awesome game, and still has the Master Quest mode after you beat the game, that I didn't do yet, but sooner or later, I will revisit this vast world, and save Hyrule again.