Depends on what your definition of legend is. He's done a lot for boxing and kept it in the mainstream a little longer in the '00s especially his fights with the current 2 top fighters. However I disagree on the fact he revitalized the sport as others here have said. To revitalize something means that you're bringing back a sport that was dead. Boxing was never dead in the 90's when Oscar hit the scene, especially considering that decade produced the 2nd greatest HW era behind the '70s. And the state of boxing in the mainstream has always been determined by how healthy the HW division is.

Oscar is a great fighter and in my eyes he's a legend, but barely makes it.