John Cena's heel turn at the Elimination Chamber was one of WWE's most shocking moments. By Cena's admission, the run that followed fell far short of expectations.

The creative direction behind Cena's heel run, and his farewell tour more broadly, has been criticized as rushed and disjointed. Cena, 48, abandoned his heel character, the first time he played a villain in 22 years , in a losing effort to Cody Rhodes at SummerSlam. He reverted to the colorful, kid-friendly hero that a generation grew up with.

The record-setting 17-time world champion admitted this week that his heel run missed the mark and shouldered full responsibility for its failure.

"I just know I failed," Cena said during a fan Q&A at Fan Expo Chicago . "Ain't nothing wrong with that. You can learn from failure,

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