No, it is up to the coherent extrapolated volition[1] of the dictator's people. (At least, it seems like a good guess.) What makes a government less than ideal is its failure to apply that volition. The question then is how hard a given type of governance is likely to fail.

Now I agree that for a host of reasons (like taking one's own volition for the country's CEV), dictatorships do not rank high.

[1]: http://singinst.org/upload/CEV.html

The point of a dictatorship is that the people don't have a say. The dictator does what he wants and portrays himself as benevolent through state-run media.