Here is why "Battlerager spikes" would never work in real life:
~| ~
~| ~
~|==> ~
~| ~
~| ~
~ = Skin
| = Armor surface
You know which one is the spike, right?
At first, all seems well.
~| ~
~| ~
~|==> O
~| ~
~| ~
The O is a bone
Here, the spike has penetrated the enemy's amazingly unarmored skin. Score, right? But he's hit a bone. Bodies have lots of those. Let's see what happens in the next frame, shall we?
~|~
~|~
==>O
~|~
~|~
Now, the spike is embeded in BOTH peoples' flesh. Great weapon, one that hurts you just as much as the enemy. Not to mention, now you're stuck together. Not to mention the fact that if the enemy is wearing armor, the spikes wouldn't even make them twitch in pain in the slightest.
My avatar isn't a battlerager because I think his weapons would work. Rather, I imagine him dying horribly against all takers, in true DF style.
In summation, I suppose there is a moral to this:
Spiky armor would tear fleshy, boneless, unarmored targets to tiny pieces. But if you're going up against fleshy, boneless, unarmored targets that AREN'T fleshballs... well then you're obviously not playing Dwarf Fortress (unless it's a titan. Enjoy losing your life to it's Toxic Secretions as you try and hugrape it to death).
I wouldn't on the other hand, mind it if armor that "menaces with spikes of ?" made an enemy more likely to run away, due to the fact that it's menacing. Armor quality and decorations could make a good warrior look even more intimidating. They just shouldn't do any damage, and you can still have your spiky armor that's useful.