Greatsword will certainly completely change the way melee plays, as it’s the first weapon that makes blocking really more advantageous than dodging (shield doesn’t even come close to doing that).
So far the Greatsword is an all around balanced weapon in PvP and PvE, it’s even better because it scales evenly with STR and DEX. I’d like to see other weapons reworked similar to the Greatsword in viability instead of Gravity Well, Riposte and Ice Shower being why you chose the weapon.