I hated every minute. Most of my buildings I refused to upgrade until I was already in Woodelves so that I could upgrade straight past them. I'm not sure why anyone would want to turn their beautiful cities into a pile of mud.... unless you're a crazy Orc like
@Gargon667.
Mind you, I wasn't a fan of Fairies buildings or Woodelves buildings either. I really like some Dwarven buildings and hated others. The best times for me were chapter 5 and S&D.
Well most building had so bad stats they were hardly an improvement over the previous chapter lol... i think back then the first level of the houses was actually making them worse per square haha, but they fixed that so that now each level gains a minute amount in efficiency, but nothing worth fussing over. The T3 factories were so bad I skipped them entirely until halflings, when the next round came around lol. The armories were really cute though, and a pet dinosaur
So yeah worst building upgrades (if one can even call them that) out of any chapter! Can also be seen in all the event buildings, no gain into Orcs, huge gain when leaving Orcs
One thing though: All the mana/seed etc buildings make T3, before switching to mana in woodelves. And those buildings actually have a great T3 production efficiency (must have been a mistake by Inno!) far better than any T3 factory will have for many chapters to come! So if you´re in that chapter spam all those buildings and get rid of your T3 factories instead!