#10 CM Punk
The outspoken and feisty CM Punk climbed the highest heights of WWE, winning the world championship. He asked for his release after losing in a feud to Triple H on the basis it hurt his career, though many in the WWE roster would LOVE a chance to lose to Triple H.
Why WWE doesn't need his services: Punk is considered something of a prima donna by his peers, and is also known for going off script in matches and interviews. One of the things that made him stand out as a wrestler was his MMA training, but after a devastating loss in the octagon, he no longer can play that card. Given his poor attitude and constant mockery of the WWE since his release, there's not much incentive for WWE to hire him back, CM Punk chants or no.
Will John Cena beat Ric Flair's record? A former WCW Champion thinks so HERE
There you have it: Ten wrestlers the WWE should never hire back.