Couple of observations, with regard to other comments:
1. I don't want to sound trenchant, cause I haven't played many games in AND, but it seems to me that AI is getting weaker and weaker as the development of AND progresses. It is much like a impression not pure facts. I'm NOT happy about it but all I can only say bitterly: I told you so..... In my opinion AI can't follow up with the changes of gameplay, new rules, features, and buildings. Simple reason, and no solution. Bitter, but true
2. I don't suffer from unhealhtiness and unhappiness anymore. It goes too easy, IMHO.
3. I like the promotion and upgrade of troops became easier and cheaper. It is far more realistic this way that it used to be in BtS
4. AI civs still know how to annoy human players

In my previous game, Brennus declared war on me. Why, why, why anyone would start a war to an empire which is located thousands miles away on a different continent and has 2.1 power ratio? I just don't get it. Also, I don't understand, why is the AI trying to get my tech which is worth 4000

and offers another one of 3000

value, and wants additional money for this "excellent" exchange?
5. The industry solves the problem of production (of course in later stages in the game). Excellent! On the other hand, food reduction is a big step in right direction.
I'm not sure if building industry in city cross causes unhealthiness?? It really should.