I still enjoy Civ apart from the dumbshit AI.
In my last game (last week before I started a new game), Mongolia decided to start a 1,000 year war with me. My entire civilization was on an island and it was impossible to get past my fleet of ships. They threw wave after wave of frigate at me, and kept trying to send embarked land units over. After about 200 years of this, they decided to open their offer of peace. At this stage I had lost maybe 2 units to their 20+. Their offer was to give me a 10 turn peace treaty in exchange for 10 turns of peace, a city, 200 gold, 5 gold a turn and all my natural resources. I said no and the war went on. Eventually around the 1,000 year mark, when I decided I'd have enough of levelling my guys and sent some land units near their border, they settled for just peace on both sides.
So as far as I can see, the AI is still as mad/dumb as a bag of fish.
This is with the G&K expansion.