For all of the places I've flown PRC immigration has been the worst. FWIW - HK was a breeze for us this March.

It would have been one thing to wait in a single line for more than an hour, but waiting in one line for more than an hour, getting to the front and being told I am missing a tiny hand-written validation document of my onward travel, told to go to the transfer desk and come back (to the end of the line).

I go to the transfer desk to get the hand-written validation 'postage stamp' and was told by staff at that desk that I didn't need the validation, so I go back to the original line to disagree/argue (which can be a losing endeavor in one's non-native tongue) with an immigration employee explaining I was explicitly told to get the validation stamp from this exact counter.

I finally wear them down and get the stamp, go back to the original line get to the front after waiting another hour, and was told I was in the wrong line, and directed to another line with an hour wait.

That was my experience.

And here's the thing, there was at least half-a-dozen others enduring the same disorganization. Keep in mind, I'm not making a direct comparison to any one country versus another. I am simply saying that I'm done with mileage runs that involve China, as enduring their disastrous immigration process is a waste of my time.