Everyone has an opinion, even Trent Reznor..
Nine Inch Nails vs. Johnny Cash
When Trent Reznor was asked if Cash could cover his song, Reznor said he was "flattered" but worried that "the idea sounded a bit gimmicky." He became a fan of Cash's version, however, once he saw the music video.
I pop the video in, and wow... Tears welling, silence, goose-bumps... Wow. [I felt like] I just lost my girlfriend, because that song isn't mine anymore... It really made me think about how powerful music is as a medium and art form. I wrote some words and music in my bedroom as a way of staying sane, about a bleak and desperate place I was in, totally isolated and alone. [Somehow] that winds up reinterpreted by a music legend from a radically different era/genre and still retains sincerity and meaning — different, but every bit as pure.