Probably Adventure of Link. If you were gaming back then*, you'll remember - that was hyped to hell and back and for a long, long time. Pushed release dates, cryptic details and screens, cartridge shortages, etc etc etc.
As for the end result: I mean, I'm one of those Zelda fans who really loves AoL. I was a little frustrated by some aspects of it, but the departure in gameplay was fine with me.
*: In the USA anyway, I don't know how the launch went in other places.