Chinese datasheets for chips usually are missing important information and include useless information like their manufacturing line inspection criteria. They waste time, because we have to contact them every bloody time. The USA is WAY head of the game in that department. Mind you, this is a generalisation as there are big exceptions on both sides. Eg: Honeywell in the USA is worse than most Chinese companies with their documentation quality control.
The other issue is most Chinese companies do not think it is important to hire a technical writer who is competent in English to translate their comical instruction manuals. A friend tried to start a business translating for them, but no-one was interested. They do not understand that their product is more attractive if they don't write in Chinglish.
As for the products themselves, it is a mixed bag. Some of their electronics products are excellent. Other products, downright dangerous and non-compliant in any western jurisdiction. And many of their products use blatantly stolen IP.
I have had the good fortune of procuring high quality electric devices out of China, but I always have to deal with their sales department to get all the information I need.
China is still by and large a backwards country. Things will improve when the adopt adopt more of western thinking to engineering. Give them 20 to 30 years.