To preface, I recently bought civ IV and enjoy it. Have been thinking about buying V. I see a lot of posts about how dumb the AI is -- as I understand it, to some degree this was hidden a bit in IV by the stacks of doom but with the complexity and micro intensive nature of 1upt I can see how V could be more affected. I don't know anything about the other aspects of V AI to comment. Given the popularity of V, is it that the AI doesn't detract enough from the enjoyment of the game overall to be a game killer? Or is the vast popularity of the game partly due to the relative (to IV) ease that you can eventually "master" beating the AI at high levels?