There are VERY few enemies with any kind of armor
Bleed damage is very low, it stacks but only works on enemies that bleed
The crit for swords is 1,5 times weapon basedamage, so its x % chance to do 5-10 extra dmg
The conclusion is that theyr pretty much useless all of them, but on the other hand, at least they work unlike perks like "tower of strenght" that does nothing..............
Tower of Strength works for me. It significantly reduces the effect that "Fus Ro Da" has against my Nord Warrior. I'm not playing fully patched though, so maybe a later patch broke it.
When a patch or mod comes around that gives creatures Armor Rating, and gives NPCs higher Armor Skills, you know what perk is gonna be the clear winner. My Nord Warrior does see a noticeable difference in damage against heavily armored NPCs (Bandit Chiefs, Random hostiles that spawn in full Ebony, etc) between his Daedric Sword and his Mace of Molag Bal. He's perked 3/3 Bone Breaker, so it does have some effect.