#5 Damien Sandow
Damien Sandow started his WWE career in 2006 as Idol Stevens, teaming with KC James and managed by Michelle McCool. He was released a year later but was re-signed in 2010 before making his debut as Sandow in 2012.
The Sandow character was full of potential and it was evident that he was WWE championship material. He even won the Money in the Bank briefcase in 2013 but was booked like a loser moving forward. His cash-in against John Cena failed, he was demoted to the lower mid-card, and he even got the impersonations gimmick.
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But despite all of that, Sandow managed to get popular with the Damien Mizdow character, a stunt double for The Miz. Mizdow was one of the most over superstars during his peak but the WWE just did not know how to use him right. Sadly, Sandow was released in 2016 even though he was still popular with the fans.