A lot of centerbacks of the 90s and early 00s have been talked up way too much when comparing them to today's generation of centerbacks. While defenders like Ramos or boateng are reduced to being brain dead athletic players who can play nice long balls but have plenty of errors in their game the old center back generation is regarded as some sort of semi god class of defenders who didn't do much with the ball but where flawless in their defending without any mistakes. Truth is, defending nowadays has become a lot harder for centerbacks with the high defensive line and more tasks expected like playmaking etc. and the likes of Cannavaro, thuram or maldini made plenty of mistakes as well.
In terms of legacy reduced I'd say Owen Hargreaves. Him being a horrible commentator, a shit pundit and ending his career as a crock has led to no one rating him at all it seems. People in England hate him because he played for united and united fans hate him because he was permanent injured after his first year. However he has won the cl with two teams, played on the highest level for two top European teams, was a vital part in uniteds double in 2008 and one of the few players who showed up for England's national team during the golden era.