If we exclude Konoha. Suna, I like how the main city is presented and Sasori/psycho Gaara came from this. Amegakure is great too, they have Pain. And I like the design and atmospher of this city/country.
Oto...meh. Kiri not so bad but we saw anything. Kumo and Iwa...
Kishimoto has hardly developed the other villages (except Konoha), it's a pity. There was plenty to do. I would have liked to see a real war between villages (not in flashback and at larger scale than the attack of Suna, Oto against Konoha), it would have been better than war against zombies and plants.