The first 2 Total War games had really good maps (Shogun and Medevial Total War), of course thoese were 2d. Rome: Total War's map, not so great.
To be quite frank we are going to ignore calls to go back to a 2D map. Not out of spite but for a very solid reason. First please read this article http://tleaves.com/2010/12/31/a-battle-lost-through-attrition/
We've all read that there is not a huge market for historical strategy games, this is a small niche. Yet think how people watch the history chanel for example. There is a huge interest in history but not in historical games. The article I linked gives you a very clear reason why. Historical games in look and interface a very poor mainly throughtrying to please there existing fans and not reaching out to new ones. We need to embrace new technologies and concepts in order to keep our games looking current and reach out to new players. New players is good news for you, because if we sell more we get bigger development budgets meaning we can give you, our existing fan base, more AI, more features, longer testing all for the same price we charge we now. We want to give you better games and if a 3D map is the way to do it then we will ignore your call for a 2D map for your own good.