i don't think theres ever been anyone as popular as The Rock in the 90's apart from maybe John Cena now (he is SO POPULAR it's not funny), maybe Batista when he was World Heavyweight Champion, and other guys like Rey Mysterio, The Undertaker and Kurt Angle (when he was on Smackdown and an absolute machine).
As for Nash, he is a personality (doesn't wrestle often) affiliated with TNA (Total Non-stop Action) which features names like Sting, Scott Steiner, the Dudleys, Christian, Kurt Angle, Samoa Joe, Jeff Jarrett, AJ Styles, and so on. They use a six-sided ring, and at times, have had spectacular moments.