The AI is an offence to any fan of the series; if Firaxis changes the mechanics, and implements a different system; they should be sure how to make it work properly; they messed it up; and abandoned the game, basically. This game is huge and complicated; but the state, at which they released this game is not accaptable; people should not tolerate this practice; people should not buy the game at release and never pre-order because there is a big chance is it not working as supposed to. Furthermore, many important issues like the AI actually never get fixed. Modding can improve some things, but let's be fair; they are very limited (time, money etc.). Civilization has unlimited potential; a great game, no question, but the things and how they handle them is not acceptable. They should focus more on the game quality, not money. Releasing half-products only destroys the game and franchise reputation... In my opinion, Firaxis failed with Civ5.