This was such and easy one to decide and calculate. I went over who I thought was the best here: Top 5 Promo Guys in Pro Wrestling and the worst stick out like a sore penis.
As mentioned in the above post that the ability to be able to manipulate the crowd positively and negatively can influence a successful career even if your physical ability is below the industry standard. It can also very easily be the reason that creative will have nothing for someone. There are great wrestlers out there that never hit the pinnacle the of business due to simple fact that the crowd does not care about them. This list is some of the guys that enjoyed various success in spite of them being completely fucking inept behind the mic.
I'm still unsure about how I feel about the Iron Sheik. He's a drug ravaged racist and bigot but you can laugh at him like when your Grandpa yells at the nightly news. The Iron Sheik was a little before my time but I understood the character he was casted to play. He was the face of evil for America at the time. The scary and foreign terrorist who came from Iran to take away our baseball and bald eagles. He was put up against some top guys in the business Backlund, Hogan, Slaughter, Piper but to me his character lacked depth and his in ring work was very boring, slow, and lazy. He either refused to use English or never changed his gimmick for decades with his broken sentences, his long ramblings, or the same fact that he beat Bob Backlund in 1979. It kept this charade going on for his whole career somehow with enjoying a large amount of success. The simple fact that he was awful during his promos can't be ignored. The Sheik's career to me is a total anomaly.