#4 Alex Riley (2011)
Alex Riley was honestly, quite over in 2011. He had just turned face on his master, The Miz and beat him on pay-per-view. He was going in the right direction at that time, until he hit a speedbump called John Cena.
An incident involving the 16-time World Champion caused him to lose his way in the WWE. His next act of significance in the company was a stint in NXT as a commentator, which happened years after the undisclosed incident took place.
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You would be forgiven if you couldn't recall Riley being part of the 2011 Raw Money in the Bank Ladder Match. That was likely the peak of his WWE career.
He could have been so much more, but unfortunate incidents will leave us wondering about what he would have been. Right now the only thing Riley is remembered for, is being buried by John Cena.