You can’t run a country like that. If all you have is a single dictator and layers of yes-men, none of whom dare even peep, that dictator will pursue utterly unworkable plans well past the point of no return if only to save face and avoid admitting to a mistake.
Hitler was the perfect example of this: Even if you factor in all of the other strikes against his whole régime, some very serious defeats were due in large part to his position as Unquestionable Lord and Master. The long delay in the German reaction to D-Day was caused because nobody wanted to be the one to wake him to deliver the bad news; his ego and unquestionable power caused one of the worst single German defeats in the entire Second World War.
Stalin might be a counterexample, or might be proof that as long as you don’t add a futile war to the list of all your other insanities, a country as big as the USSR can survive even absolute dictatorship. Of course, perhaps Stalin was closer to how China Guy described Mao.
(A less serious example might be how Steve Jobs ran NeXT into the ground: After leaving Apple, Jobs wanted to pursue his hobby-horse of building the ‘desktop supercomputer’ by building a very nice GUI around a Unix kernel. (Sound familiar? ;)) So he created NeXT and produced NeXT cubes with a dictatorial zeal. He delayed production to get the cases to look just right, he pissed off Bill Gates enough to ensure MicroSoft* would never develop for NeXT systems, and he used technology that was most assuredly Not Ready for Prime Time. The result was a machine that was Insanely Great in some respects, at least on paper, but never came close to living up to either its potential or earnings expectations. It launched in the late 1980s (1989?) and generally stumbled to its death sometime in the 1990s.
At which point Jobs became head of Apple again and turned Macs into what the NeXT cubes would have been had someone at NeXT been able to tell him ‘no’.)
*(I’m pretty sure it really was spelled that way then. They also had a geeky round logo, instead of the ugly flag. They also weren’t monopolists, though they were fairly popular.)