Lower populations, and then I have to build 4 farms in order to build one city?
Seriously?
What, exactly, do you guys think the term "game balance" means?
Two things:
Higher quality farms produce more. Adjacency bonuses produce more.
Population now = 1 production point. Before, it was the square root.
Before: Population of 9 = 3 production points.
Now: Population of 9 = 9 production points.