Dwarven crossbow has a base damage of 22 and a dragonbone bow has a base of 20. So its not too overpowered taking into account its reload time...I actually typically have less problems avoiding a crossbow wielding foe than a bow wielding foe in my game. And this is near point blank range.
Anything ranged is easy to avoid, just jump around! I bumped into a dunmer who flung many fireballs at me, I not only avoided every single one whilst imitating master chief, I also managed to jump around his opening power attack, whip round and bury my sword in his spine

a PVR, my thanedom for a PVR!