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).
With its many synergies
the Greatsword makes you not only punish the enemy, but also be rewarded for blocking, especially for blocking at the right moment.
But one thing was left out, the “sturdy fortification” perk
It would be the second weapon in the game that could use this perk and it fits perfectly into your playstyle.