Factions may be "balanced", but only because every faction has basically the same unit selection.

The french have longbows. Are you taking the piss CA?

The english have 2 units of spearmen with IDENTICAL stats, negating the 4 unit max rule entirely.

Not to mention 3 different types of footknight, with just 1 stat point between them.

Not to mention 4 different types of cavalry with just 1 stat point between them.

So balanced it may be. Interesting? Not really.