* If tomatometer & audience score are within 5% of each other, you can trust the ratings to give you a decent indiciation of movie quality.
* If tomatometer is more than 15%+ higher than audience score, it means it's an artsy fartsy movie that critics like and movies don't.
* If audience score is 15%+ higher than tomatometer, it's a fun movie even if it's not oscar worthy. (https://www.rottentomatoes.com/m/old_school is a perfect example)
The show that always sticks in my mind as an example is HBO’s Watchmen, which has 96% with critics and 56% with the audience.
Black Panther, for example, was a perfectly fine film... but who isn't bored of Marvel stuff now, and is it really worth 96%? Higher than The Dark Knight? And even that was probably somewhat overrated due to Health Ledger's passing...