The least used civic in each category is...
Government: Police State
Legal: Nationhood
Labor: Serfdom
Economy: Environmentalism
Religion: Pacifism
Some comments
Police State: I used to run this civic all the time, but now I almost never use it.
Nationhood: Why is everybody bashing this civic? I once used it to gain 22 Strength Infantry (I was being Kublai Khan, on Warlords), in exchange for 2 population, so that I could continue building infrastructure while still getting a fresh loads of troops. Then again... I myself only use it when I'm being an Aggressive leader and have a technology advantage (Ragnar, here we come!)
Serfdom: Good for recovering from a large-scale pillage of your lands, but if that happens, your pretty much losing anyway.
Environmentalism: The reason why people hate to those who ask, is that there is always a better civic to run. If you are pushing for Domination, State Property is a good bet (why is that civic getting bashed? I still use it until I can see that my economy is ready to live without it). If you're trying to launch a massive-scale corporation economy, Free Market will lower your costs. If nobody wants to sign Open Borders with you, Mercantilism can be okay (also if everybody is running Mercantilism and you're not dependent on foreign trade routes, or if a rival is dependent on trade routes with you and you can close them up without cancelling Open Borders). But Environmentalism INCREASES costs of those UNGODLY EXPENSIVE Corporations, and the Health and Happiness isn't worth it unless you need more Health and/or Happiness and you can't get any via other means. Did I mention that the Happiness is dependent on how many forest/jungles you have?
Pacifism: Strange that I don't run this civic, considering that I like Specialist Economies and tend to have only 1 unit guarding every city.
