I made Scattering Armor useful by adding Emissive Armor ability to it. So, it's a Scanner Jammer, it boosts your defenses (or would if the game calculated properly) a bit, and it's just as good or better at deflecting a certain amount of damage from your ship. Why not? Isn't it "a highly reflective material"?
Also, the AI is not real bright about cloaked ships so the stealth armor an also be very useful, especially early in the game.