Mulan sucked, but mostly because "Crouching Tiger Hidden Dragon" did the plot better 20 years ago. https://www.youtube.com/watch?v=DzkhVVFRIIg
Mulan fell into the same wishy-washy problem so many of these other recent movies fell into. Was Mulan supposed to be a wuxia / Chi-based kung fu movie where one exceptional warrior makes huge differences on the battlefield? Erm, maybe.
Or was it supposed to be a somewhat gritty war movie akin to the original cartoon? Erm... also yes, sometimes.
As such, we never got the spectacular fight scenes you'd normally get from Wuxia, nor did we get the grittier, tactical kind of Mulan that the cartoon was. The directors were faced with a choice and they chose "both", which in practice means "neither".
Disney movies aren’t doing great because they’re boring, plain and simple. “Messaging” has nothing to do with it.
At this point, if you don't see it is because you don't want to see it.