In my opinion skirsmishers, archers, ranged units in general are overpowered, some players are using them as "raiders", poking early thanks to their movily and their power, if u are roman or spartan or some civ that Its main base is infrantry or even caballery u are in disadvantaje, recently played macedon against sparta, he was getting basic units skirmishers and hoplites peroikos when i was getting slingers some skirmishers and elite peltast. That wasnt rentable and I ended up losing, they didnt even get near the skirmisher, they died in the way. Also I suggest that fortress towers and city centres to have more attack both when are empty and when garrisoned, and to have some kind of early defensive tower like a woden tower, not a watch tower, that can also be upgraded to stone tower maybe.