The right place for the right thing
From the looks of it, this movie is getting a low review because of brazilians that disliked the cast's protest in Cannes and just had the idea "Let's give them a low rating everywhere".
All that before the actual debut of the movie anywhere besides the festival.
This became a political discussion, and this is not the place for that. As a fellow brazilian, when I want to know about the movie, I really would like an actual critic, not more political blabbering. I guess IMDB will have to clean up this mess some time in the future, because for now the rating does not have any solid base.
So, is the movie good or not? No one knows.