This shows you what a slacker I am...I play at "Emperor," wher the AI gives me little trouble after the first 50 turns (and not much before that). It certainly will not wipe out my Civ...but just may keep me a little more honest. It is almost more about beating the clock, along with making decisions on the fly, rather than an external threat (the AI). For what it worth, I don;t thaink and AI that can't do decent midevil combat with be good with aircraft, or tanks. They might do OK with a nuke, if thee ever could build it.