Assuming the damage tooltips are accurate.
I think that the proc damage from sets such as Thunderous Plate Mail, The Ice Furnace, Coat of the Red Mountain, ect. The current damage proc is below laughable. I purpose that these numbers be increased from their current base to 120 damage at green, 150 blue, 180 purple, and 210 gold. This would make these sets much more useful and a viable choice. The AOE procs will need tweeked from the above stated numbers or be put on a longer cooldown timer or something but 9 damage is a joke.