As far as I'm concerned, the good mini empires servers (which sadly, I never participated in) were sort of like roleplaying.
But of course, instead of playing as some crude superhero with some deep dark backstory who must slay the evil of the world and whiteknight his crush...
You play as an empire.
Sort of like a strategy game, like C&C or Civilizations, except roleplaying most of it because there were no add-ons involved, aside from some bricks.
But nowadays all I see is power hungry admins and really stupid people complaining about them all the time.