Yea. Civ 4's AI was dictated by die rolls mostly, along with calculations of power level, etc. The problem with that is that the AI had little ability to adapt to a situation, and many of them were easily 'shut down' just via "active diplomacy". Not to mention that only a few AIs were ever capable of winning versus a competent player, many others played so poorly (Pericles *cough*) that they could never win. On the other hand, certain AIs (Shaka, Montezuma), were dangerously aggressive, often irrationally so. I'm not saying it was terrible, but the AI (Which is the basis of diplomacy) was always Civ 4's biggest flaw.