I understand your concern. However, Black Panther is now an event movie. It doesn't need WOM to build an audience, the audience are already there. Based on comments on Korean/Taiwan/HK movie review sites, people might not love the movie, they don't detest it either. Many simply find the movie "boring" and "average". Even if it's considered an "average" Marvel film, it has good photography and physically attractive actors. It will do well in China.