Battlefield Earth was bad, but I still laugh when I think of Travolta calling Barry Pepper rat brain. (I like Barry Pepper BTW)
I never tried to watch the "Battlefield Earth" movie; the "coming attractions" and previews led me to believe that it was going to be a piece of trash.
I did, however, really .. really .. like the book. I have it in hardback and in e-book format; I re-read it fairly often.