As a fan/student of japanese history, I'm often disappointed in Tokugawa as well. I understand the rationale behind his behavior and their civ's isolationism, but the facts are on most maps they're not isolated. Shoguns and other war leaders of the japan's ancient era's were nothing if not smart, ruthless, and very aggressive. I'd certainly like to see the AI, once Japan gets its UU, do a bit more rushing and be a bit more aggressive than they usually are. Not only to me but the other civs.