Quote Originally Posted by Conners View Post
With some of the largest swords and weapons out there, which can actually and have actually been used in war: Would a supernatural level of strength be very beneficial in wielding them?
Generally yes, but it would also depend on the level of strength the character has and whether their own body can withstand the forces exerting that strength will inflict.

There's a good illustration of this by Masamune Shirow for the Ghost in the Shell manga, where a character has a cybernetic arm that can lift 200kg. Unfortunately, the arm's attachment to the body wasn't suitably reinforced, thus the first time the arm tried to lift such a weight, it ripped itself off the person's shoulder.

Actually looking at cyberpunk and similar sci fi would give you a fairly good answer to this and would also illustrate other effects of being supernaturally strong (increased jumping ability, almost ridiculous athletic capabilities, etc).
A strong enough person would have more issue in the environment and the material of his weapon being able to cope with what he's trying to do with it, than against un-augmented opponents.

Unless such a weapon is made out of some supernaturally strong material, the only way to reinforce a standard steel or other metal weapon is to make it bigger, which means additional weapon weight, resulting in inertia and leverage problems as you've noted.

You may also want to have a quick look at the manga Berserk, where the lead character, Guts, is supernaturally strong and uses a massive slab of metal that masquerades as a sword: link.
His attacks are relatively slow and ponderous, but pretty much unstoppable when they get going.
Guts would represent the lower end of the scale - he's strong enough to use his weapon, but not so strong that it's like a plastic toy.

At the other end of the scale, you have the Monkey King who wields a 8.1 metric tonne staff like a child's toy.