Brave, proud, and wise, the war chief symbolizes the spirit of courage and leadership of Native peoples throughout the Americas during the tumultuous eighteenth and nineteenth centuries. read more
That's because they don't know how to use the advantages of sioux. Here I'll cover the topic, how to play no rush/treaty games with sioux. And it'll not be in detail. It'll be few pointers. read more
Many Germans that i face i usually Cetan/Club rush because, Like you stated, There FF is one that can actually stop the sioux. I Find it really aquward that Port and Germany are the only civ that can really stop the sioux ff with their ff. read more
So although playing as Sioux might not be that hard, it can be hard to play with Sioux since you have to help your Sioux mate so much. Also, even if you play your Sioux good, you might lose to someone playing much worse but with another civ, just because of how bad Sioux are in treaty. read more