I think a lot of these various preferences that people have are simply a reflection of their individual playing styles and the difficulty level. For me, playing almosy exclusively at Monarch level, my city pattern that I talked about in my original post is practically my only criteria, along with making sure that every land square is used, if at all possible. I pay no attention to rivers, flood plains and all the rest. This works for me at Monarch level, but it might not at higher levels.
I've recently attempted several games at the next level, Emperor, and even with my cheating method of exploring my continent first and then reloading at 4,000BC, the game kicks my hiney.