I like messing around on custom battle and it seems that for many factions (I'm going to use successor states for an example) there is a lack of variety/uniqueness to their units.
Big images incoming!
The Ptolemaic Agema
and the Seleucid Silver shields The only difference between them are the shields. They got the silver shields right by literally giving them silver shields. However the shield designs are the same . Im no history buff but did the ptolemaics and seleucids use the macedonian star on their shields?
Here the Baktrian and Seleucid Hyspapists have the macedonian sun
Here are the "African" and Indian elephants
Here the silver shields swordsmen look like the ptolelmaic thorax swordsmen.
Another thing I wanted to point out in the Seleucid roster was that there is no difference in the Agema and companion cavalry. Unit price is the same too. I could have sworn agema were more armored than companions but less than the cataphracts.
THe baktrian companions have a nice added touch to them.
Bottom Line: Lack of diversity. Lots of recycled stuff and bright Pastel colors.
The upside is the BAktrians look very cool. The colors used are nice and not sore to the eyes.