Likely a very wide spread in quality. Norenco, which is a PLA run corporation, makes stuff that is sold around the world. At least somebody in the Chinese army knows enough how to run a business, which is not likely the case with the Russians military leadership.
The guy that makes the Chinese history podcast that I have been listening to reads from declassified UK intel reports from Tiananmen Square every anniversary of that disaster. The transcripts he reads does not make the PLA look good at all. Things found there:
Troops initially ordered to attack the square refused to move.
Other troops were ordered to attack the troops that did not attack. They did follow through.
When the second group did not quite get the job done, other units were ordered to attack the remains of the first two. At this point the units being sent forward were of illiterate peasant stock and were being told they were attacking counter-revolutionaries.
Lots of dead civilians and military that never even reached the square.
Bottom line is that, at least 30 years ago, the Chinese military was a mixed bag and a lot of it not very capable or reliable. Those that were reliable were not very skilled and often illiterate. China still treats the peasants badly even today and still uses them in their army.
Edited to add a links for where you can listen to this.
https://podcasts.apple.com/ie/podca...n-square-massacre/id741606139?i=1000476755923