4. Ultimo Dragon
Arguably the greatest masked wrestler in the history of professional wrestling (Although same can be said about the likes of Hayabusa), Ultimo Dragon wrestled all over the world and earned the reputation as the greatest high flying wrestler in the modern era. In what can only be described as an impossible feat, Dragon once held ten different titles from various promotions, a record that hasn’t been broken till today!
So when it was reported that Dragon signed with the WWE, all the fans were excited. After all, he made a name for himself in WCW in the cruiserweight division, and had become a sensation in WCW. Dragon had a relatively lackluster career in the WWE, and was gone within a year. This is considered to be WWE’s biggest mistake till date, something that most of the critics and fans agree in unison.