SlipperyJim
Prince
Dueck said:Cliffs:
labour is the least useful civic category
I really think it depends on the stage of the game. Late-game, the unhappiness from Emancipation really makes the Labor civic choices more or less useless. Just switch to Emancipation when your people get cranky, and don't ever look back. Before that stage, those other Labor civics can be very useful.
Slavery is the civic to have in the early game. When food is more common than hammers (a common occurrence, at least for me), using the ol' whip is key to improving your civ. I particularly like to pop-rush when a city is nearing its happiness limit; if that citizen is going to be unhappy anyway, I might as well get some production for it!
I will admit that I don't use Serfdom much, because I usually spam so many workers that my terrain is good-to-go without any additional help.
Caste System isn't a general-purpose civic, but it certainly has its place. Running an Artist in every newly-captured city to pop the borders can be great for a warmonger. Merchants can get you out of the economic hole caused by overexpansion. Scientists can give you the technology edge. And the "combo" possibilities for Caste System are huge ... add Representation for additional science, Sistine Chapel for additional culture, etcetera....
In short, I think that all of the civics branches are useful. There are a few individual civics that I rarely use (Nationalism, Serfdom, Pacifism, Environmentalism), but not so many as to render an entire branch "useless"....