The reason a person does a lot of dmg is because their AP is multiplied by their skills. Your DR will remove their AP. If you have enough they no longer do dmg. The problem arises when you don't have enough DR, then it's just a waste. The same with evasion. It's all or nothing, I have had plenty of geared players do little to no damage against me. They can't penetrate the DR. Their crits don't matter because they essentially have no AP. The real problem with this build is you need the DR from PEN Caphra enchants, it's a lot. And you need way beyond soft cap to maintain AP this way. If your sitting at around 300 DP your simply dead.