Minors. Small hordes. Tribes.BTW, when I say human-controlled I'm just talking in general, like when you click onto a nation and think "Oh, not many troops here, better build more", but then you quickly realise "Shit, I'm at my limit already. Why does this country have such a crap landforce level limit!". Same for economy, income etc. I suppose sliders will come into it a bit.
A lot of us can turn a turd into a tiara in this game, but which nations where you surprised with in regard to relative difficulty.