IMDb has made “adjustments” to the reviews, which are 4.7 “unweighted”. They “adjuste” it allegedly due to conservatives “review bombing” the movie.
The movie has become an outlet for conservative rage against Karen culture, but really the movie itself is not that bad. The "black" mermaid is mostly white, and the message to little impressionable princesses seems to be to try to marry a white prince, the top of the gene pool.