After looking over the current Gran Faust and Archeron balance, it appears that, as the Faust Line inflicts Curse, OOO believes that it is acceptable to give it the same base damage as an Archeron.
However, in my experience little is gained from the extra curse, as the chance of cursing an enemy with a normal strike is very tiny. Nobody uses the charge attack, as the no-attack penalty (Especially if you have the stock 2 weapon slots) given if you curse yourself is not at all worth the risk. Some may argue that the GF's extra knock back is the advantage here, but the Avenger has a clear advantage in damage over the other 5* Elemental Swords (Minus rocket hammer), so I think some difference in damage is to be expected. [Note: Here I mean damage as in numerically, not DPS]
The obvious solution to this, is to make the charge attack more usable in some way, so the curse effect of the Faust actually becomes useful, and a resource to players which is worth the lower swing speed. This could be done by increasing the curse chance on a normal swing, or even to get rid of the curse-self chance altogether.
So Forums, what do you think? XD
I already thought Gran Faust needed a buff even before Acheron itself was buffed...