As far as I can tell, the only platform that I found with medium level of reliability is metacritic.
I tried Letterboxd, Serializd, IMDB and Rotten Tomatoes, all of them tend to be very unreliable.
Is there is any other platform that has reliable ratings/reviews?
I started with Letterboxd. Then I found half a dozen movie reviewers I like and generally agree with and follow them on Letterboxd. Then when I look for a movie’s ratings, I look at what the general average is and what each of the reviewers I follow have rated it.
When I like, say, comedy horror, I know the average reviews are going to be low. But the 3-4 individuals I follow who also like comedy-horror, they will rate a movie in that genre higher and I am generally going to rate the movie similarly. They are also more likely to leave an informative review.
Any other system that is solely aggregation is going to be useless for less mainstream movies. Like the comedy-horror, lots of people simply don’t like the genre. Foreign language movies will get a ratings hit from people who don’t like subs, totally unrelated to the actual quality of the movie.