I dont know about the rest of you... but I dont think I have ever used the ability "Coordinated strike" with my biped alt. Maybe because it requires someone else to use the same ability directly after you use it for it to have any effect.
And that might be a possible solution... effect, as in visible effect. A flow of sparks or smokeor something to show that the mob has been struck with this ability.
Or maybe make the initial strikedeal 110% damage?
I think this ability should be revisited and enhanced in some way to make it more useful. Right now it just takes up room in my hotbar, and it will surely be the first hotkey to be replaced if I run out of room.