If you're not put off by subtitles, any fan of war films and heroic fantasy should watch this. Though it seems odd they haven't done an English-dubbed version, which would get it through to a much wider audience.
They could also try a different title. Maybe Superheroes of the Fall of the Shang Dynasty. For Chinese and other East Asians, the idea of mortals becoming gods is familiar and believed by the religious or superstitious. A belief also found in Classical Greece, but confusing for a Western audience.
It is an heroic fantasy, loosely based on the actual fall of the Shang, 3000 years ago. A concubine who was widely blamed in later histories is re-invented as a Fox Demon - another concept unfamiliar in the West. And it is actually simplified from the original legend, which has three spirits sent by an offended goddess to be destructive concubines who made a bad man worse.
Which may be no more historic than Shakespeare's Macbeth, but certainly makes a good drama.
It seems this legend is even better known than Journey to the West / Monkey, which is much better known in the West and had a recent much-rewritten film, as well as a Japanese television series that was popular in the West with dubbing into English. As I said, maybe humans become gods is too odd in the Western view, though the very popular superheroes are essentially the same.
The plot is complex, and I found the palace guards confusingly similar. But it was entertaining, and is the first of three.