give low-budget trash and exploitation films a bit of leeway here; it's the terrible stuff done by people who should know better that I'm less forgiving of. And stuff like Creeping Terror and Plan Nine from Outer Space are good fun to watch.
But yes, Battlefield Earth is jaw-droppingly bad. Special mentions also for Girl on a Motorcycle, The Room, Glen or Glenda (sorry Ed) and the Fat Slags movie.
Films I need to check out—to see if they're as bad as people make out—include Rancid Aluminium, Sex Lives of the Potato Men and Norbit.