This feels really good. The map actually feels a bit more alive, and more complex than just a collection of resource nodes. The benefits of building on flood planes are huge with the extra fertility, but the damage when it does flood can be severe. I've been lucky not to be struck by storms so far, but sadly my starting continent doesn't seem to have any volcanoes.
The mid game feels a lot more engaging, especially with the new world congress, and the diplomacy points. It's nice that they're a tradeable item, as you are now literally trading for diplomatic favour, so it feels like you actually are building relationships over time.
I'm not sure if the AI has been tweaked, or I just got lucky, but in my current game, they seem to be acting much more normally than they used to, so that's another good change.
Enjoying the expansion so far. It's finally starting to feel like a complete Civ game again. Can't wait for them to launch VII with all these features missing again.