Honnestly thoses dmg seems hight but Ok for me since I'm pretty sure Soke use berserk and weapon buff. It costs mana, and protection.
Leg you can ask Compost, my barb hits also quite hight even on buffed archer without berserker. I mostly use Thrist for blood.
Leting a barbarian fight at close range is by the way a mistake. They are made to own at melee and Marks are made to own (at range).
All I know is that when playing a Marksman if i'm fighting far from ennemies I almost always win, otheriwse i'm going down slowly or fastly depends on mana, and buffs