When I've won with every vanilla STW2 faction at Legendary - i.e. probably never!

Seriously because I love the Heian period and the Tale of the Heike and the Yoshitsune are my two favourite Japanese books I can't see myself enjoying a campaign which makes far too many changes in historical terms (if it was accurate you'd have just two factions with armies made up entirely of samurai horse archers and useless peasant levies - which would hardly be Total War).