I never have really taken time to do diplomacy until RTW. It isn't polished, but it's better than MTW's. YOu really have to try to be proactive in the diplomacy and keep your good face up or your allies or those in a ceasefire with you might start to forget your good nature and start looking longingly at that juicy settlement. In 2 years of diplomacy with the Thracians I turned our bitter war into a peaceful Protectorate - nicely skyrocketting their economy in the process.