Metascore 53 from 27
RT has 46 reviews, why has MC only 27? I bet RT includes more small sites with MC/DC fan focus.
17/27 reviews have a 60+ score, translating to 63% fresh.
Considering it opened in UK and 6 others Wed, I would expect more MC and imdb (real) reviews by now.
https://www.metacritic.com/movie/aquaman/critic-reviews