Okay. Well reasoned. I can live with that. Consider the Injury rating adusted.
FWIW, the rule of thumb for RPGs and finding the right balance: IF one choice is obviously better in multiple ways than others of it's ilk, then it's design is not quite right.
In the instance of your greatsword, the damage was better than all swords, and the injury was as good as an axe, and the Edge was better than an axe. So that's the reason I could see that there was reason to question. In other words: why use an axe?
In D&D 3rd / Pathfinder - Haste for instance is almost a go-to spell for 3rd level spells. It's typically considered to be the first choice. Lots has been said about it's relative power in the game. Stinking Cloud was always a very popular second level spell - so they moved it to 3rd level to offset it. If it's an obvious choice - better than any others in that category, then there's a design flaw.
MMO makers struggle with this all the time; they see that there's a trend of all players selecting the same "build" and they realize they made something too lucrative - so they update it and nerf it, and usually wind up ruining it's effectiveness completely by swinging the pendulum too far the other way. Then 2 months later they have to make another adjustment. Meanwhile the players have all gravitated towards another obvious built.....rinse and repeat....