So I was using knightmare for a bit to try it out and was pretty impressed by it. So aoe maim is better than any of the maiming abilities for a reason beyond the obvious: It makes the enemies glow.
This lets you know who is maimed and who needs a refresher. It's pretty much the same as taunt aura but blue.
So it would be great if it was possible to actually see debuffs/buffs being applied from some skills.
Like major ward for instance, if I use refreshing path to proc it I can tell when it ends because they both last 11 seconds. Shades lasts twice as long as the buff so you don't know when it is gone.