I'm medieval age half done with lvl 7 walls. I stay 200-300 medal range - commonly find bases with 80-100k resources (80k gold AND food, not combined) and don't lose more than one or two infantryman per raid. So in my opinion it's good but I haven't tried out higher levels.
100% agreed. I selected Greeks as well and am regretting it greatly. However, I consider 'nations' to be...I don't know, different difficulty levels? Best nation perks = easier to complete than one with low perks. So I'm not sure, unhappy I chose Greeks but awaiting the challenge.