Well, I think the answer to the map issue is pretty simple. Keep the 3D map but have the same response (battle ensues) whenever an army crosses into a province. Thus you can keep the beauty of the Rome campaign map and also have a situation that the AI can handle whereby armies always meet when a province is invaded (and all armies in the province meet the invader).

I can play a battle in RTW and more or less only lose the men killed by friendly fire. This often leads to 10 to 1 or even 100 to 1 kill ratios. In MTW a great battle would have about a 5 to 1 kill ratio (especially if playing with a Mod that turned peasants off). What's more, there are lots of battles that are really close, especially when the AI (which moves last) unexpectedly reinforced. I don't think I ever lost a battle in Rome once I learned how to play. I lose battles all the time in MTW. Also having many different factions to choose from in MTW is really good because it keeps the game fresh. I think that if CA can provide a decent AI and can put speed sliders on both the campaign and battle maps in BI then I would give Rome a second chance. Otherwise I will just wait and see if they can regroup and get it right in the next game because RTW really did miss the mark.