The battering ramms are too powerful. 2 of them can destroy 1 civ center and a few towers, still having more than half hp. And that is without the upgrade. The resistance and/or hp should be lowered, but the attack is ok since it's a close-range siege.
There is a bug where a group of units (especially in organized formations) get stuck in 1 tree and start spinning until you fix it manually. Also, sometimes after a building is captured, the infantry starts spinning for no reason.