Sure, if you wade into a mass of lost souls with low level guys you’re gonna get smashed. Just like if you don’t use the proper tactics for, say, orcs. It is annoying when your bros flee for like 3 turns and then you have to get them back into the battle, but it’s really not that bad. Just use the right tactics and they are basically slightly more annoying en masse than chasing down archers.
Minimum to hit them with ranged is not locked at 5 either, I’ve seen as good as 17% with a decent ranged guy and crossbow, no height advantage, 6 spaces out. I’m guessing with more specialization and better conditions that can go way up.