* 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)
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The Last Jedi
Tomatometer 91% Audience 41%: Artsy Fartsy
[Really?]
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The Greatest Showman
Tomatometer 56% Audience 86%: Fun, not oscar worthy
[Won Oscar for Best Original Song]
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EDIT: Truthfully, it was the release of these two films (both Dec 2017) that caused the Tomatormeter and I to part ways. Simply indefensible, IMO.
TLJ: cultural elites liked the whole burning the sacred texts thing, normies hated it. (NB: I only vaguely remember this movie and don't have strong opinions about it, don't crucify me.)
The Greatest Showman: I assume "not oscar worthy" meant specifically not "Best Picture" worthy. It's a specific type of movie that wins that award.
In any case, just like you append " reddit" to most searches, I recommend appending " letterboxd" to any movie searches. You do kind of have to read the reviews instead of just going by the rating though.