It isn't really a question of agreement or disagreement. In the PRC people are jailed for complaining too much, or complaining about the wrong thing. You can't have an accurate picture of what people think about the state in those circumstances, especially when this information is distributed solely by government-sanctioned and/or actively censored outlets. Like that joke Zizek tells sometimes:
"A German worker gets a job in Siberia; aware of how all mail will be read by censors, he tells his friends: “Let’s establish a code: if a letter you will get from me is written in ordinary blue ink, it is true; if it is written in red ink, it is false.” After a month, his friends get the first letter, written in blue ink: “Everything is wonderful here: stores are full, food is abundant, apartments are large and properly heated, movie theaters show films from the West, there are many beautiful girls ready for an affair—the only thing unavailable is red ink.”"