RT has some questionable ratings.
On some new movies the rating is very high, but it goes down sharply.
IIRC one of the Fast and the Furious "movies" had a stupidly high rating, which is now more sane.
https://www.rottentomatoes.com/franchise/the_fast_and_the_fu...
IMDB seems to suffer from this less.
The only useful thing on RT is their one line blurb.