Honestly, I think Ocarina of Time is the most overrated.
Don't get me wrong it is an amazing, revolutionary game, however, while people still consider it the best zelda game of all time and say nothing will ever compare to it, is quite silly.
It was the best game of its time and remained so for a while, but since then many new Zelda games have been released and in my opinion are better than Ocarina of Time.
I think it is so overrated because people are too afraid to let go of the past and the memories they have with the game. Everyone has a special connection with something, and for many people it is Ocarina of Time, so it is hard for them to admit and realize that it's no longer the 'best zelda game' because if it would be relased right now, exactly the same as it was in 1998, people would just laugh. It is an amazing game, and nearly perfect, but it is very overrated.