No, people who do nothing but complain and who are clearly unhappy with the business of education in China should leave, rather than be unhappy staying in a system they hate.

Exactly, my dear!
Like you, I'm sick to death of reading so many negative posts from a handful of regular posters teaching in China who have nothing better to do than gripe about everything and anything not to their liking in the country they CHOSE to teach in!
It's also worth mentioning that they initially signed contracts that stated certain terms amd conditions pertinent to their specific employment, and later are dishonest enough to blame their Chinese employers for what they don't like that they signed happily for in the first place. They need to take a good look at themselves before they vent their misplaced anger on anyone posting on this board with what's clearly a more enlightened view.