I think Bret "Hitman" Hart is underrated on the mic. He didn't stand out against all the over-the-top gimmicks in his era (Macho Man, Hulk Hogan, Ultimate Warrior, Million Dollar Man, etc.), but his more realistic style fit his persona of being the best technical wrestler instead of an over-the-top character. I remember his promo after beating Ric Flair for his 1st WWF Championship, and it was a great interview, because it came from the heart and he meant everything he said 100%. By no means was he great, but I think he was pretty good.
As for other guys people have mentioned like Randy Savage, Sid, and the Ultimate Warrior, I disagree 100%. All those guys had a ton of intensity and charisma, and were very entertaining on the mic as far as I'm concerned. Savage is one of the greatest promo cutters of all time (along with one of the greatest in-ring performers), and people just denigrate the Ultimate Warrior because of that hatchet job video the WWE put out on him. His crazy, over-the-top, hyper-intense promos full of allegory and symbolism were a PERFECT fit with his crazy, over-the-top, and hyper-intense character. Which is a big reason why his popularity even surpassed Hulk Hogan's for awhile.
As for other guys people have mentioned like Randy Savage, Sid, and the Ultimate Warrior, I disagree 100%. All those guys had a ton of intensity and charisma, and were very entertaining on the mic as far as I'm concerned. Savage is one of the greatest promo cutters of all time (along with one of the greatest in-ring performers), and people just denigrate the Ultimate Warrior because of that hatchet job video the WWE put out on him. His crazy, over-the-top, hyper-intense promos full of allegory and symbolism were a PERFECT fit with his crazy, over-the-top, and hyper-intense character. Which is a big reason why his popularity even surpassed Hulk Hogan's for awhile.