Well, I've never played any FF series games myself, but I can certainly say FF6 is not a 'forgotten game' - I keep noticing how whenever someone brings up FF6 in anime/rpg-related circles, a cheer is heard throughout, with a few possible exceptions like myself who have absolutely no idea about the game.
I'm kinda embarassed that I know absolutely nothing about it, and only slightly more about subsequent FF games - it's quite possible I'm missing out on a classic.
Then again, seeing how these same people never tried some of what I consider 'classics', I call it even

The Birds are using humanity in order to throw something terrifying at this green pig. And then what happens to us all later, that’s simply not important to them…