I have not seen the movie.
One reviewer thought it was making fun of white liberals. From that perspective,he thought it was good. The journalists must not have seen themselves being made fun of in the movie.
Rotten Tomatoes reviews are 100% positive. Is everyone scared to criticize a black movie?
Critics don't expect much from horror movies. If a horror flick scares people and the film makers can change a few of the oft-repeated features of the genre, critics will find it fresh and appealing, especially if there's a political message in there for them to agree with.