The shocking heel turn of John Cena had been raised by many big wrestling figures and it is already being considered one of the best heel turns in professional wrestling history. He had been working as a babyface for more than 21 years and Cena also been the prime face of WWE throughout this time.
John Cena won the men's Elimination Chamber match at the Elimination Chamber event on March 1 and earned the right to challenge Cody Rhodes for the Undisputed WWE championship. Rhodes personally came out to congratulate after his victory. The Rock also joined the party and after getting a sign from him, Cena shocked everyone.

John Cena's Heel Turn Was "Cinema" Claims Former WWE Champion
Cena attacked Cody Rhodes and beat him down badly, finalizing his heel turn in more than 21 long years. This was something that nobody expected to see and this shocking turn of events also added more excitement for WrestleMania 41. Former WWE United States Champion Matt Hardy recently shared massive praise for this segment. Speaking on his ‘Extreme Life Of Matt Hardy podcast’ he explained;
John Cena is a 16 times WWE World Champion
“I thought it was very well done. I thought it was great, I think it is good for business, I think John was very generous in being up for it and I would imagine he’s pretty excited for it with everything being considered. You know, you see people post all the time and this whole meme is done to death nowadays, where they put this is cinema. When you see the thing where he pulls him in, he hugs him, the facial expression changes, Rock looks at him and does the thing, that was cinema though.

John Cena had been a babyface for more than 21 years
"He backed off, kind of smiled again, then kicked him in the nuts. The way it was executed was done perfectly, it was shot perfectly, the storytelling of that moment was huge and I think that is something that is going to be a huge positive and plus for WWE business over the next few months leading into WrestleMania.”
Check out Hulk Hogan's perspective on John Cena's heel turn here
Fans and wrestling figures are comparing this epic heel turn with some of the most iconic heel turns from the history like Hulk Hogan turning heel back in 1996 and Andre The Giants's historic heel turn from 1987. Some of the fans are even considering it as a better heel turn than the ones it is being compared with, claiming it to be the best heel turn in professional wrestling history.
H/t Fightful