#9 The Cult of Brock Lesnar
When Brock Lesnar returned in 2012, he actually didn't have much of a notable first couple of years, being bogged down in a feud with Triple H. Then he beat The Undertaker and broke his fabled WrestleMania streak in 2014. Since then, WWE has turned Lesnar into Ares, God of War.
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His altar has lacked no share of victims, and as a result, Lesnar's cult has prevented anyone from getting over. This is, more than anything else, the direct cause of why WWE is so lacking in star power today.
For example, Braun Strowman got red hot in 2017 and was sacrificed to Brock Lesnar. Even Roman Reigns, the guy who was supposed to ultimately benefit from Lesnar's ascent into godhood, was sacrificed. Even Seth Rollins wasn't allowed to beat Lesnar cleanly at WrestleMania 35, but by that point, any benefit that could have been had from Brock Lesnar's ending Undertaker's streak was long gone.
It was a gigantic waste of five years, the very five years that the company began hemorrhaging, rather than merely losing, viewers.