That's such a good point Thejeff. In order to have a decent chance of imposing your game plan against Impossible AIs (which I like to play against most of the time), especially in early and midgame, you have to have great skill, knowledge, and maybe most importantly, not be unlucky.
If you start getting squeezed between 2 or more Impossible nations set to Aggressive (try setting them all to impossible and aggressive!) you're in a pretty scary position as they hurl army after army at all sides of your empire.
It's pretty good practice.
