[@thewizardguy]
In terms of strength, as said, he could compete with Metal Gears (quite easily) and Armstrong (he lost but kicked ass). The only issue would indeed be the life fibers, which I somewhat remember when I saw the anime a couple of years back. Though doesn't a direct hit actually gradually weaken a Kamui user? Added to the fact that they're always using blood to fuel their power.

I'm inflating Sam's skill because of his various feats when fighting cyborgs with much superior strength and bodies than his. 

Also a weaker version of his sword was capable of withstanding MG Ray's gigantic blade strike with ease. I don't know how some super strike would destroy it. Though I would agree he would have a hard time handling her strength coupled with how swift she can be. But this life fiber thing does seem rather silly to fight against.