Okay, so I'm just guessing... any video game over a decade in the making is bound to be some kind of letdown right?
Well technically it's been remade and modified endlessly and hasn't really been 'worked' on the entire time, hence the developmental hell. This game has a hell of a developmental history, probably enough to make a documentary on it.
Also, to stress how significant this is: there's jokes going around that this news is more surprising than the second coming of Christ would be.
But yes, it'll likely be a letdown anyway.