Wrestling isn't the only talent WWE superstars need to master in order to be considered main event caliber wrestlers. They also need to effectively project their in-ring character with the help of excellent skills on the microphone.
Take CM Punk and John Cena, for example. These two superstars are arguably the first and second best wrestlers WWE currently has on their roster, and they reached these heights with their impressive mic skills.
But of the two, CM Punk is the clearly the best in the world.