Rotten Tomatoes does not measure the quality of a movie, no matter what your favorite YouTuber says. What it does measure is the percentage of critics who think a movie is at least decent. The higher the Rotten Tomatoes score, the firmer the consensus is that a movie is at least "good," rather than, say, an exact quality score of the title.

Still, even if it doesn't exactly measure quality, a Rotten Tomatoes score is quite useful to get an idea of whether a movie has a wide appeal or if it's polarizing (meaning different people have vastly different opinions on the title). When it comes to anime, even if the genre is becoming more and more accessible, more mainstream, and more accepted, there are only four anime movies with a 100% certified fresh rating on Rotten Tomatoes.

What's curious is how different, yet very similar, the titles are. That's because,...