I'm one of the people that thinks this starts well, and goes a bit odd with the Agricultural Revolution. I would like to think that perhaps some of the language isn't clear, as the author does try to separate the differences in benefits to the individual (more food, more babies) and damage to the culture (food homogeneity, lack of sanitation).

But it just becomes less enjoyable to read about how everything went downhill since we were able to do all our foraging in a few hours (somehow) and then murder the weak in the tribe.

I haven't entirely put this down but I don't think I'll finish it. I'm currently being confused by the "empires: are they all bad?" section.