What does Zelda U have to score for you to not consider it a let down?

[SuperNova]

It doesn't have to score anything. I don't measure my enjoyment of a game by metacritic scores.
While it's fun to look at and cheer for a game on metacritic, that doesn't have any bearing on my personal experience with the game.
All it has to be for me to be satisfied with it, is to be a good game.