1st: Do you play any games with REV Off?
2nd: I Never use Slavery Ever. So if it's OP I wouldn't know anymore from My side of the game. Obviously the AI Does use it. And that is what needs attention.
3rd: I feel many of the Civics are too haphazard (sorry EldrinFall), but that's How I see them. Instead of a logical progression for each category you can have an early civic give +15% hammer and +50% more food needed. While the next "advanced" one eliminates the +15% Hammer and gives a +25 % more food to grow. So you lose 15% production for a 25% eduction in Food growth? Not even a good choice but one you end up taking because you need some pop in those cities by Ancient or Classical Eras. This is just a top of the head example. But it's something I wanted to say something about, but when the Civics got changed I hadn't had time to get in game practical use to say "Hey wait a minute" about it.
4th: It seems we are going Overboard to reduce gold/turn. I'll continue to stay on this bandwagon for some time to come. There are Other ways to balnce game play without being bankrupt most of the game. Cause Not Everyone plays On Emperor or above. And I'm "Damn tired" of upper level players making the game a tedium instead of Fun!
Enough opinion for now, I'm getting emotional instead of logical so I'll stop here for now.
JosEPh