I was thinking of BtS. Try to claim, with a straight face, that the experiences of a lot of seasoned players of Vanilla Civ IV and Warlords didn't go into the fashioning of it. I seem to remember that the game information specifically mentions that the AI is smarter. In addition to that, of course, the programmers and QA people were very experienced from devising other strategy games. And then there were the beta testers.