#8: Kimbo Slice
By the time he arrived in the UFC in late 2009, former street brawler Kimbo Slice had already been basically exposed as a fraud in the MMA world.
Pushed as the next Mike Tyson by the Elite XC promotion, Slice defeated a trio of lower-level opponents before being knocked out by journeyman Seth Petruzelli, and it seemed like his career would probably be over from there.
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Surprisingly though he was brought into the UFC in 2009 to take part in the tenth season of The Ultimate Fighter. After receiving insane amounts of hype he was easily beaten by Roy Nelson and eliminated from the tournament, but it felt like every subsequent episode teased a comeback that never happened.
Even after that he was brought into the UFC proper and beat Houston Alexander in a truly terrible fight at the Finale show. Still refusing to read the writing on the wall, Kimbo returned again, only to lose in one-sided fashion to Matt Mitrione – a loss that mercifully signalled the end of his UFC tenure.
Slice was handled better by the UFC than Elite XC as he was portrayed as a guy who lucked into fame and was trying to improve himself rather than being the baddest man on the planet, but the mere fact that they actually used him three times means they overrated his skills.