"""The critical strike damage enhancement provided by an un-fused Crimson Marrow Ghost Claw is merely 25%, which, though high for equipment, isn't that high."""
Zhang Yanhang said this mainly because percentage enhancements like these seem high but, in reality, aren't that significant.
For example, without any enhancement, a 100% bonus is a solid 100% boost, but if you add another 100% afterward, that's effectively only a 50% increase from the original, making the damage only 1.5 times the original. Only a simultaneous increase of 200% would double the damage again.
Once you have a 300% bonus, another 100% bonus would only yield 1.25 times the original damage. Therefore, his threefold critical strike damage, although it seems substantial, is in fact just 1.5 times the initial twofold damage—it's not that impressive.