I voted for police state but...
I would explain my uses for civics, I won't comment the first line ones.
Hereditary rule : When my cities are not developed but I've enough military to keep my people happy.
Representation : Good when I've all developed and happiness is not a problem, I've built SoL, also I've a lot of specialist + I've focused on science.
Police State : I voted for it

I don't care for war weariness and For military production I don't need it, when I need defensive military I will use nationhood, when I need offensive, I prepare for it and use Universal Suffrage.
Universal Suffrage : When I've very good Income. Kremlin would help.
Vassalage : Good for early wars, in peacetime it's useless.
Bureaucracy : One of the best civics. It makes my capital very powerful and I can produce my border city troops. Later game I'll switch it away.
Nationhood : When I've trouble to defend my cities, I'll draft extra defenders.
Free Speech : Good for later game, Must have for cultural victory.
Slavery : Very nice in ancient/medieval eras. I can produce troops for defence quickly, usually I've it until I'll get emancipation.
Serfdom : I use it very rarely, only when I have poor developement for some reason.
Caste System : When I need specialist strategy, combined with Representation, Mercantilism, Pacifism.
Emancipation : It is nice to make **** for others, the bonus for faster developing towns I don't care.
Mercantilism : I ignore it unless I use specialist strategy.
Free Market : When I'll get it I'll switch it. +1 trade route is not bad. Only In island games it is useless when I've not discovered astronomy yet.
State Property : When I go for domination victory, otherwise I don't care for it.
Environmentalism : Pretty useless, Because I couldn't choose two civics I chozen the police state but actually both are useless. It's only the kicking ass civics to cripple others' economies. I think that firaxis should remake it. a) Just an earlier tech should reveal it (Biology for example) b) Improve it (Cities grow 2pt after filling the food cap or +0.5 for farms)
Organized Religion : Very helpful because in beginning production is slow and +25% is a needed help.
Theocracy : Good for Vassalage.
Pacificm : Good for GP/specialist strategy.
Free Religion : When I didn't manage missionary spam.