A movie so horrible that not only was it a critical and box office epic fail, but its producer, Franchise Pictures, was convicted in court over it due to a scam in which the film's budget was overstated. Not to mention an indelible scar in John Travolta's career. And cult status for the movie in the future? HAAAAAAAAAAAH!
In short, Battlefield Earth was so bad that the producers were convicted of a crime. That simple.