#4 Was Great: Ken Shamrock
Ken Shamrock was one of the UFC's earliest stars. The mixed martial arts legend had a memorable rivalry with Dan Severn that actually transcended the UFC.
In 1996, Shamrock struggled to make ends meet as the UFC was not the financial titan it is today. He signed with WWE primarily for the money, but after spending time being trained by Bret Hart in the infamous dungeon wound up being one of the best in-ring performers of the Attitude Era.
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Shamrock didn't limit himself to a traditional martial arts offense. He was perfectly willing to snap off a Hurricanrana cradle or victory roll, which he did with explosive speed. While Shamrock would never be World Champion, he left an indelible mark on WWE history and fans often think he was underutilized during the Attitude Era. After his pro wrestling career ended, Shamrock returned to the world of MMA.
He was a large part of WWE's Attitude Era setup but his skills were underutilized as he mostly feuded with midcarders like Val Venis and Goldust amongst others.