* 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.
I still use the ratings (because they're built into Plex) but mostly as a novelty, and sometimes as a puzzlement. Increasingly, you see scores like 5% tomato, 95% audience (or vice versa!) that I'm sure mean _something_ but rarely anything to me.
Exceptionally good movies (which Paddington 2 is btw) will trend heavily toward 100% and any drop from 100% are from outlier reviewers. Citizen Kane has 1/131 negative reviews and Paddington 2 has 2/253 negative reviews.
If you want a rating of quality you can always just click on the score and see that paddington 2 has an 8.7 aggregate compared to Citizen Kane's 9.9.
* what percent of viewers will not regret watching the movie. That makes this a combination metric of quality and variance. A low variance 7/10 will beat a high variance 8/10 in RT score