Finished my game with Hungary. They are pretty powerful with the Levy mechanic, but I won't say overpowered. I had the AI steal my Suzerain out from under me even with Amani fully promoted and the extra 2 envoys for levying (she outbid me when I was at 12 envoys I believe). Luckily I had a couple envoys saved up and got the suzerain back, but I lost all my levied troops.
I moved my settler 4 turns to get a nice bend in the river, and ended up playing warmonger all game and not building a single district adjacent to my capital. My only district was an encampment, but that doesn't get the production bonus because it's not adjacent. Oh well. One of these days I'll play a peaceful game with Hungary.
Barbarians calmed down after a certain age (I don't remember which ones). First 2 or 3 eras they spawn the next turn after you clear one (sometimes only 2 tiles away in the fog). But when I went conquering on the other continent, there were no barb problems over there. Strange. I guess I can deal with increased barbs in the early game. But it makes it hard for peaceful civs like when I played Mali, because my trade routes kept getting plundered.