In what way would they be horrifying? The Romans advanced public works, infrastructure, and other such things on an absolutely monumental scale. Many roads built by the Roman Empire are still even in use today! And I think Marcus Aurelius is perhaps the best example in history of a genuinely socially motivated leader. And the lands under their rule were completely able to maintain their own unique identity so long as it did not lead to attempts at rebellion/revolution.
Of course one practical issue you run into is that while Aurelius was perhaps one of the greatest leaders of all time, his son and heir - Commodus, was perhaps one of the worst of all time. But at least if we speak of the eras prior to its decline, Pax Romana in particular, I don't really see how the Roman Empire would be horrifying. And in any case dramatic deterioration of the quality of public leadership, probably presaging a more broad decline, is clearly not limited to systems of minority rule.
Of course one practical issue you run into is that while Aurelius was perhaps one of the greatest leaders of all time, his son and heir - Commodus, was perhaps one of the worst of all time. But at least if we speak of the eras prior to its decline, Pax Romana in particular, I don't really see how the Roman Empire would be horrifying. And in any case dramatic deterioration of the quality of public leadership, probably presaging a more broad decline, is clearly not limited to systems of minority rule.