Aristotle distinguishes 6 govermental forms, exaqctly 3 type and good and wrong from each
One man rule: monarchy --- tyranny
Group rule : aristocracy --- oligarchy
All men rule : Constitutional government --- democracy
He decides that the constitutional government is the best being stable and responsible,
and the democracy is the worst, lacking either the stability and the responsibility
Also somewhat weakening the above evaluation Aristotle added that neither one man not all men can govern, always a group governs.
Rousseau understood that all governments are based on the consensus of the governed people, and this is true even for the dictatures. I lived under dictature: about 10% benefited from the system, and their relatives friends expand int to the minimum one third, which keeps the system alive, and the majority of the rest do not resisted.