#6 Sergeant Slaughter
Had Sergeant Slaughter won the WWF Championship a decade earlier, there is a strong chance he could have had a successful reign.
However, in 1991 the veteran was broken down to the point he could do very little in the ring. Hampering him further was the fact that he was playing an exploitative Iraqi sympathiser gimmick whilst the Gulf War was in progress.
Hurting Slaughter's credibility still further was the fact that he only won the belt due to Macho King Randy Savage walloping his opponent, Ultimate Warrior with a scepter leaving him a sitting duck for the challenger.
Warrior was beaten and Slaughter would reign as Champion for two months before predictably dropping the strap to American hero, Hulk Hogan at Wrestlemania VII.
Slaughter's reign was a disaster at the box office and forced the WWF to relocate Wrestlemania VII from the 100,000 seater Los Angeles Coliseum to the 17,000 seater Los Angeles Sports Arena due to poor ticket sales. Needless to say, Slaughter was never considered for another World title run and would retire as a full-time performer the following year.