the best example of a successful non-democracy in the modern world is China. Their internal party system is extremely convoluted, but basically the party internally appoints members to positions, notionally on meritocratic grounds, though corruption and manipulation is endemic. Here is a more detailed summary.
Given the seeming economic success of this model would it be sensible for other countries to adopt it?
Is it possible to introduce sufficient additional safeguards against corruption and abuse of power?
Do you consider The Great Leap Forward and The Cultural Revolution a success? That's only about 50 years ago.
When you're trying to judge the performance of a system of government, some historical perspective is required.
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.