#2 CM Punk
CM Punk being on this list doesn't come as a surprise. Punk expressed his frustrations about his WWE career in his infamous "Pipebomb" promo, which took the world by storm. After becoming unhappy in WWE, Punk retired from professional wrestling in 2014, and then pursued a career in MMA, and was signed by the Ultimate Fighting Championship in December of that year.
Punk was a very popular figure in professional wrestling. He was a fan favourite and many considered him their favourite WWE Superstar. He was one of the best wrestlers in WWE history. Unfortunately for Punk, he was fighting his own battles in the company.
On an episode of Colt Cabana's Art of Wrestling podcast, Punk broke his silence regarding his exit from WWE. In a detailed interview, Punk said that he was suspended for two months after walking out on the company and that after the suspension ended, nobody from WWE contacted him.
Punk also told that when he reached out to them for unpaid royalties, he was given a run-around by company executives until he was handed his termination papers and was fired by WWE on his wedding day in June 2014.
The manner of firing was the last straw for Punk, stating that he would never return to WWE and that following a legal settlement with WWE, there would be no further working relationship between them.