* 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.
Wouldn't the "cultural elites" in this context be the hardcore Star Wars fans who hated everything about the new trilogy, and Luke's disillusionment arc in particular, and the "normies" be the mainstream fans who really didn't care?
TLJ got great critic reviews and poor audience reviews because it was propaganda designed to please movie executives and their friends who don't care about Star Wars but do care about social engineering (the badly named "cultural elites"). It wasn't intended to please the people who paid to go watch it.