Brief.

I agree that the fifth one looks better than the sixth, but I also like the sixth. The main thing is that it shouldn't consume too many resources and should be informative enough; after all, it's Civilization. The quality of the graphics in this game is secondary. Although, if with such graphics it requires as much as the third Witcher (or whatever is the current benchmark for video card resource consumption)... then that would be an undeniable failure.