Bad reviews are mostly from poor understanding or anti-female
I've read lots of complaints that don't really make sense to me.
1. Mulan was not a "chosen one" Ch'i is simply an energy force that is inside everyone. She developed her skills through a lot of focus, hardwork, and training. Trained by her father who was also a greatly skilled warrior/soldier. This is shown early in the movie.
2. Anti-female are the people who call it "SJW nonsense" Really they will find anything wrong with a strong female character and just call it "SJW" You can't have a strong female lead without these people complaining.
These are the 2 biggest gripes that everyone repeats. Neither are valid.