USo Mac scored white steel at 50 points which I believe is not right. If that was the case, good luck beating his holder. Here is how I would score him based on his fighting attributes.
Armor: [10] The armor is simple. It defends from a few strikes. The real killer is in the mending. But I put that many points because it cannot be pushed or cut by shardblades
Mending: [20] I rated this with respect to shardplate. White steel would lose a great deal of components if he was hit by a war hammer, but he would mend. He could block roughly 4 shots from a parshendi warhammet and shardplate could block 6. So a total of 30 for defense next to shardplate’s 40 seems fair.
Movement aiding: [5] In reality, this will only stop someone from tiring and aid their strength barely. No reflexes. And once again, next to shardplate’s 40, 35 is fair.
Gunpowder: [30] This is his prime offensive capability. Explosions outside his armor result in deveststing close combat and preventing being grabbed. Compared to the surge of division, this feels fair.
Shape Changing: [5] Other than mending, this does nothing but provide weapons and grab on to things. Not that powerful or unique.
Total: [70] (Previously 80. I miscalculated)