>>96548913
The Papal intervention force initially seems gimped, but you realize how insanely good they are once you have the extra glory.
I'll say in a dead on fight prussians come out on top, but Papals having the ability to make early purchases like the Jawbone, or knighthoods is very powerful in the long term.

Red brigade also offers the retardedly powerful gunslinger perk for just *5 Ducats*. Which allows you to take two auto pistols and get what amounts to a machinegun you can use as an assault weapon.

The only one I'd say is actually underpowered is Eire, since a lot of their faction specials need a serious tradeoff (Berzerker having the LT wear no armor, Hit-And-Run still triggering Melee attacks, etc.)