I never used bows so I don't know if there is a difference but crossbows seem very op. My current crossbow does 215 damage, ignores 50% armour, does 25 fire damage and 25 frost damage.
I play on the highest difficulty yet this is no challenge, I do more damage then dual casting fireballs and I can do shoot a lot more then I could fireballs.
If I'm in sneek with ciceros gloves I can do about 2000 damage in a single bolt.
I will probably just ignore crossbows from now on because I like the challenge but it's disappointing that the thing I looked forward to most is insanely good, to the point I don't want to use it.