yes, i saw, after many online battles, that all units(without phalanx) was very weak against cavalry attack.
There is many type of armoured cavalry(like bactrian bodyguard 29! of armour) that charge in front the spearmen and kill 30-40% of them.
Also cavalry not died after that, but can easily escape from melee...
So cavalry re-charge in front and spearmen rout : i want only avoid this.
It s right that cavalry give great damage from the back, but isn t right if it give about same damage from the front.

I did many test for take a look of thing to do.
And after that i made this edu for have more balance between infantry and cavalry, and between barbarians and hellenics.
I also noticed that barbarian factions are very weak in multiplayer due to their bad armour.
Increase shield value is the best solution in my mind, because shield defence become double for missile attaks from the front.
Now also barbarian and light infantry are more protected from archers and, especially, horse archers.

This edu isn t already complete... i want try it in mp and thinking about it is right or not.