Rast, I wanted to point this out to you. You are concerned about the balance of government types. I think this is good, but here is something that I have thought about.
Through out the game I use different government types based on what I do. For example after a DDD I use BURC then move to capitalism once I have my factory built to I can refine three items. BURC for the many trades, and then Capitalism for building quicker. I am also rarely aggressive; therefore, you will never see me with a government type that has warfare bonuses.
I am sure other people use different government types for the way they play the game.
If by looking at the government and they appear to be unbalanced I do not believe it means that a government type is unbalanced, but instead more players are using a particular strategy. Perhaps the strategy is unbalanced.
To sum up what I am saying, at times by looking at the government types there may appear to be imbalance, but I believe there could be other reasons for the imbalance then an imbalance of the governmental powers.
That's very true, but under those assumptions balance becomes impossible. I define balance as each government presenting a strategy that is for one reason or another advantageous to adopt, as well as there being no major imbalances in numbers of each.