Firaxis is launching a massive patch for Civ 5 which addresses a lot of the criticisms about he clueless AI. This patch list has so many fixes but one of my personal favourites is
"New “Angry Genghis” loading screen (replaces the “fluffy-bunny Genghis” loading screen)."
There are also some fixes to reduce the memory footprint so hopefully that will stop the game from crashing later on (something which has all but stopped me playing.
Some commentary on Ars Technica here