#2 Bo Dallas
Bo Dallas is a former NXT Champion. Allow me to repeat that in different words - Bo Dallas once held NXT's most prestigious title.
It seems hard to believe if you've only known Bo from his main roster run, but he was legitimately one of the best things going in NXT for a while. Playing the part of a white-meat babyface, the Full Sail crowd eventually grew tired of him and booed him at any opportunity they could. Strangely enough, this was the best thing that ever happened to him. Instead of "pulling a Bayley" and retaining the entirety of babyface character despite the audience's derision, he used his obnoxious persona to steer into the hatred. His whiny heel character was nothing short of golden.
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He tried to parlay that into his main roster run with his slightly modified "Bo-lieve" gimmick and, while it was entertaining, his matches were pointless and his win streak was snapped by R-Truth, of all people. From there, he was never taken seriously again - he joined the Social Outcasts (basically a modern J.O.B. Squad) and paired himself with Curtis Axel and The Miz to become the awfully-named Miztourage (basically a poor man's J-and-J Security).
To think that Bo Dallas was once at the top of a wrestling company's food chain for 280 days. It almost seems laughable now.