Got my 4 piece today and it seems very underwhelming especially for frost. Did multiple tests and runs and it seems to only be doing about 3% of my total damage which is awful for a 4 piece in the last tier of the expansion. Comparing it to last tiers it, this one has nothing on it.
I wonder if the devs will notice this and buff it maybe. I really wished they would of found a way to make our previous 4 set work where it would give us 50% rune regeneration for the duration of PoF.