I'm not just talking at the nation-state level, but at community, company, sports and so on. There's no shortage of Open Source projects run using the Benevolent Dictator approach.
Compare that to companies run by committee (or governments run by dead-locked congresses) which preport to "represent the people" but just turn into "nothing gets done" factories.
So yes, there are good dictatorships. They're especially good at getting stuff done.
There are also obviously bad dictatorships.