#4 Wade Barrett
In 2016, Wade Barrett left WWE. Since then, he has been quite vocal about his stint with the sports entertainment giant, especially how soon WWE ended The Nexus storyline, and more importantly, what role John Cena played in it.
As you already know, The Nexus was a faction of rookies who were led by NXT Season 1 winner, Wade Barrett. Shortly after making their debut on RAW and attacking John Cena and CM Punk, The Nexus became one of the hottest commodities in the entire WWE at that time.
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It has been brought up countless times how Cena is considered the main reason why Nexus couldn't thrive in WWE. The abrupt end of Nexus put Barrett in a no-win situation and he never became as big of a threat again.
Barrett has claimed several times that Cena is one of the greatest Superstars in WWE history. However, the two men have a high level of animosity between them and they are not even close to being friends.
“He has been the face for ten years, and he’s really good at what he does. But everyone knows that I don’t like John Cena, and he doesn’t like me either."