Inefficiency of Dictatorship

I used to think that dictatorship may be more efficient (in a sense) than democracy, as the orders by the dictator could not be challenged and would be carried out without delay. While reading Prisoner of the State (by Ziyang Zhao), I am now coming to realize that dictatorship may have more inefficiencies in its own regard - despite the existence of a dictator, people who work under him or her still has their own takes on issues which differ from that of the dictator. However, they dare not express their opinions directly to their boss. The only thing they can do is to carry out something mediocre, not exactly what has been dictated, nor what they believe would be best. While everyone doing the same, each making his or her work fall short of what their boss asked for, the government can never be really efficient.