Most annoying sandwich on the menu, takes forever to fry and the stupid bun steamer always breaks, plus standard equipment for a midsize store is the fish fryer is only big enough for two racks and you can't cook them in any of the other vats because the fish taste leaches out and nobody wants fish flavored pies (back before the baked pie came to be). I remember one rainy Friday during Lent (three conditions that always increased sales of the FoF), ugh we just couldn't keep up. Then there was my idiot co-worker that needed to be reminded how to assemble the things every single day. I think there are no pleasant memories associated with the Fillet-o-Fish from my McHell years.
I hear you!
Veteran of McD's from the paper-hat and barber shirt days.