Greg 'the Hammer' Valentine has been a wrestler for over 35 years. His father Johnny was also a wrestler.
Valentine has enjoyed a lot of success in the ring over the years. He has held many titles (as a solo and as part of a tagteam) in many organizations like WWE, NWA, AWA and WCW.
Valentine is a throwback. He's like an old-school wrestler. While he has wrestled through the cartoon era of the 80's and the attitude era of the 90's, I think Valentine would have been more comfortable with traditional wrestling of the 60's and 70's. He could work great, long matches with men like Ric Flair, Dusty Rhodes and Roddy Piper.
He wasn't great on the mic and he wasn't hugely marketable. That's unfortunate, because he has the mat skills and the knowledge advantage over most wrestlers.
That's not to diminish his accomplishments. Valentine is in the WWE Hall of Fame and deservedly so. I just think in an earlier era, he would have been even more successful.
Whenever I meet him, I am always amazed at how thick and solid Valentine is. He's not ripped and cut like others, but I bet Valentine is one of the strongest men in the business.