The game is great, it is rarely that so many elements of gameplay, roleplaying and management is assembled into one. The legionary battles could be improved. I struggle to imagine what I am fighting. So there can be improvement. Perhaps some stationary, 3d, top down, diagonal view of images of the units themselves. A single stationary Rome Total War battlefield image would be enough for now, as an introduction to any battle.
Google image search Rome Total War battlefield
Just a single image to give people an idea what they are fighting and then perhaps you can improve later on over time, what you want to ... give more detail what is happening during the battle...