It has the elements of both documentary and drama, so I would prefer to call it docu-drama.
If you're looking for a pure drama then this is not for you. If you're looking for a pure documentary then this is not for you. The makers of the show have made it a point to keep the content highly engaging without missing out on the crucial turning points. The narrative is quick and yet you don't feel like the makers are rushing. Major details have been explicitly explained without unnecessary drama and actors have done justice to their roles. Of course a full fledged show encompassing the entire Roman History is a magnanimous task, and hence the idea of a docu-drama seems feasible.
Review of Roman Empire
