I've had it for a while now, and I enjoyed it. The story was reminscent of Chinese Opera storytelling, as was the music. The contrasting use of colours is also a Chinese Opera device.
I enjoyed the music, but it sounded a bit Too reminiscent of Crouching Tiger, Hidden Dragon. Tan Dun is an excellent composer, not to mention the world's most famous Chinese composer, but his music was a bit too derivative of his previous work.
In regards to the Glorification of China, I don't see any problem with this. China is our Motherland, and I would think it's deserving of our respect. In these times where there are separatists trying to destroy our country, we Must stand up in support of the complete reunification of China.
I did have a bit of an issue with the whole Forbidden City thing though. This was set in the period of Qin, 2200 years ago. The Forbidden City was built during the period of Ming, only 600 years ago. There were other blatant historical inaccuracies, but this was the one which annoyed me the most. That doesn't matter though, since the point of the story wasn't to be historically accurate, but to convey the idea of the Mandate of Heaven, that the Emperor is the Son of Heaven, and all of China must be united under Him.