Yeah, Falcom loves this trope, though I did like the fact that in the final dungeon, it was just Class VII (old and new) and no one came to your help despite taking on some of the most powerful people in the world, like McBurn. It's not until you fight the big mega-demon that a few of Erebonia's best fighters join and fight by your side (and I don't mind there as you are basically fighting a demi-god at that point).
I generally don't like the curse as a plot point, as it reduces the human problems behind war, imperalism and all that stuff to just magic. Like, what's the message that Falcom wants to give us? That nationalism and all its problems is just caused by larger forces and surely is not the fault of the individual? Garbage. (CS 4 spoilers)
This raises another problem with those games which is the fact that power levels are scaled according to what's convenient for the plot. It's all over the place.