The first three things I would tell them? I would say it is a series of quality, the gameplay is fun, and it's even fun to think about it. I'm sure this will at least get the person to try the game. Call them buzzwords, but there's truth to them, and they will work.
As for games, I'd tell them to play Ocarina of Time, A Link to the Past, and The Wind Waker. Although Ocarina of time may not be my favorite game, I still think it's the definitive Zelda experience, and the correct choice for a first 3D game. A Link to the Past is a great 2D game, and I think it will do well to bring someone into the 2D side of the series. Finally, I will recommend that they play The Wind Waker so they can not judge purely by the art design and instead play it for what it is. Also, it's my favorite game, and I'd like to share my experience with them.