All those cases you raise, are indeed bad, but are you saying they are the majority?
The cheating example isn't a show of corruption, it's a show of fairness. If this generation of students sitting the gaokou are all cheating, forcing a tiny subset of them to not be allowed to cheat, is disadvantaging. You seem to understand china fairly well, if it were my child, I'd be angry (even if they weren't cheating), as it is clearly setting that group at a disadvantage. Perhaps if the government did it either ubiquitously or (probably better) at random each year, then the issue of cheating would go away. But to "trial" it in one area, is wrong.
> How could you really have lived in Guangzhou for any significant length of time and be so in the dark?
Perhaps I am just more optimistic about where things are at.