#2 CM Punk
CM Punk is one wrestler who is still fondly talked about by WWE fans who want to see him return to the WWE since he left the company in 2014. Punk left WWE mainly because of health reasons and criticized WWE doctor Christopher Amann's methods.
He was also unhappy at not main-eventing WrestleMania despite being one of the most popular Superstars on the roster, as well as not earning as much as others.
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He was particularly miffed at how WWE handled his exit from the company, sending a termination letter on the day of his wedding.
In a podcast with Colt Cobana soon after his WWE exit, Punk criticized WWE and Vince McMahon:
“If the apology was sincere, you (Vince McMahon) wouldn’t use it as a publicity stunt on Austin’s podcast. You have my phone number, you have my address. You could text, you could call, you could show up when you’re 10-minute drive from my house and apologize to me like a man.”
“WWE doesn’t do anything to protect the wrestlers, they do things to protect themselves… They don’t let everybody know that they’re doing all these fantastic things for concussions for ‘the boys’. They do it so it looks good on them in the public.”
Punk hasn't returned to WWE television yet but is sort of part of WWE programming as he is employed by FOX to work as an analyst for their WWE Backstage show.