Third Inn posting here.
My rating would be, more or less (favorite cards in parenthesis) :
1. Cornucopia (Menagerie, Horn of plenty, Harvest, Young Witch)
2. Hinterlands (Develop, Mandarin, Farmland, Tunnel, Border Village)
3. Seaside (Embargo, Outpost, Tactician, Island)
4. Dark Ages (Procession, Procession again, Beggar, Rats)
5. Guilds (Butcher, Stonemason, Merchant Guild)
6. Intrigue (Coppersmith, Duke, Baron)
7. Prosperity (Forge, Contraband)
8. Base (Remodel, Library)
9. Alchemy (Apprentice)
10. Promos (Prince)
I really don't get the Prosperity love. I mean, it's a cool set like the others, but the balance is weird. Goons, King's court, Mountebank and Grand Market are game changers, they are very powerful. Then you have Loan, Talisman, Mine (trolol), Royal Seal, Counting house…
And I find way more satisfactions playing a strategy using bad cards (like Mandarin in Hinterlands) than using monstrous powerful cards like Mountebank or Grand Market.