https://www.businessinsider.sg/economist-intelligence-unit-2017-democracy-index-worst-countries-2018-1/?r=US&IR=T
Compared to other authoritarian countries, China is still better. Although a one-party state, China is also democratic, but democratic in the style of China. Like Western countries, China also adheres to the political trias, namely the division of political tasks between the executive, legislative and judiciary.
The highest power in China is held by the National People's Congress as a legislative body whose delegates are elected from each province. Those chosen as members of the delegation are people who have good character and morals. So to become a delegation requires a long struggle, dedication, proof and achievement.
For the third point, it needs to be understood that from the beginning China and Hong Kong agreed to adopt a two-state system. But over time, due to conflicts of interest of each party a dispute eventually arose, many political dissidents hid in Hong Kong and undermined the Chinese government from Hong Kong. It should be understood that not all Chinese are bad, there are communists who are nationalist and honest, Alibaba founder Jack Ma is also a member of the communist party.
Even when compared to the democratic countries, China ranks much better. Democracy is suitable only in countries where the population is educated and homogeneous. It won't be successful in countries where the population is illiterate and heterogeneous. My country (India) is being regarded as the largest democracy in the world. But the democracy here is a sham, with most of the politicians corrupt to the core, surviving only on ethnic loyalties.
One thing that I like about China the most is that they have a no-tolerance policy towards the corrupt. Anyone who is caught for a major corruption scandal is directly sent to the firing squad. Now compare this to the situation here, where criminals who had raped and killed little children are enjoying their life in jail on tax payer money, although they were sentenced to death many years back. There is an unofficial moratorium here on death penalty and no one has been executed for the last one decade.
Even the elected government has very little power. Most of their decisions are getting overturned by the judiciary, where most of the judges are appointed on the basis of family connections rather than merit.