The culture slider is fine when you have 6-9 cities and are going for a cultural victory, but I felt from the beginning that it was a blunt tool. When you have a large empire playing for Culture domination/conquest I don't see how it can be efficient to feed all the commerce in your cure into unneeded culture through the slider. Similarly if you want to research, or get cash to buy cathedrals, you have to turn down the slider. Because of the advancing front line, we were spending cash at a very rapid rate (10k+ per new city at the end to set up 6 (!) cathedrals which a culture slider economy could never afford) and didn't start getting super rich until about 1940-50.