After nearly a year and two dlcs, I think it's generally agreed upon that this is the best WA in the game.
I mean, you basically become a Dark Souls 1 character for a few seconds. Combine that with the fact most of the weapons with this WA skill benefit from high STR...which also grants higher defense bonuses per level, and further combine that with sturdy to heavier armor and yeah...in a game that's as trade-centric as this game is, that's big.
The maces like Morning Star and Mace, as well as of course the Black Knight Greatsword benefit from this WA particularly well because of their great damage and solid movesets to capitalize on; but it's just a damn good option for anything that has it. It's good for PvE, and so much of the current PvP is about trades and blugeoning through crap that it particularly stands out right now.