Exactly. Dunkirk, with its 94 Metacritic score, should by all means be a masterpiece, but I found it wildly overrated.
Mother! is the only masterpiece I've seen in theaters this year, and it only has 74.
Hell, Dark Souls only has an 89, but it is undoubtedly in my top 3 favorite games of all time and considered by many game journalists to be a masterpiece.
I also think Breath of the Wild doesn't exactly deserve its 97, either.
It's all relative. A high score on Metacritic is certainly not the end all of whether a game or any other work of art is a masterpiece.