3. Sheamus
From the moment he debuted in WWE, Sheamus was earmarked for greatness. He was fast-tracked to his first WWE Championsip win when he beat Cena in a Tables Match at TLC in 2009. Apparently, being Triple H's workout partner has its benefits. But then, as quickly as he was pushed, he was depushed. He won the King of the Ring, but then went on a losing streak, and started wearing the stupidest possible costume. What happened? Sources say that Kevin Dunn happened, and that he purposefully buried Sheamus, as a punishment for getting a big head too early. If it's true, this seems counterproductive at best, and spiteful at worst. Only now, years later, is Sheamus clawing his way back to the same level of notoriety.