I think it's also useful to keep in mind that it's not just propaganda, China's government is overall doing a decent job especially if you compare to how things were before. China basically spent a century being kicked around by outside powers, culminating in the Japanese rampaging around the place for a decade. Since the Communist Party took over, China rose to become a world power, with a strong economy, strong military, and no trouble with invaders.

Clearly, the Communist government is not without its own problems, e.g. the Cultural Revolution, which I'm not trying to diminish in any way. Some of those (like the Cultural Revolution) are seen as a failure of government which the current government tries very hard not to repeat. Some (censorship, general political repression) are accepted, either as necessary or unfortunate but tolerable.

Clearly, you can make the argument that China would be doing even better under a good democratic government. I'd be pretty receptive to that argument personally. But it's pretty hard to convince people that they should undergo a radical change in government, when the terrible effects of political upheaval are still fresh in people's memories, and the current regime has overseen such improvements. Throw in the ridiculous shit coming out of Western democracies at the moment (e.g. Trump) and that job gets even harder.

Edit: regarding the downvote, let me ask: if you had to be transplanted into the body of a Chinese person at some point in time, would you rather it be 1900, 1940, 1970, 2000, or today? From everything I know, I'd vote 2000 or "today" without hesitation, and not just because of computers and smartphones.