Everyone is entitled to their opinion. I think a cover can be adapted to a band's style, as long as it is done tastefully, and each bandmate knows exactly the form and changes of the song perfectly. What is the joy of playing a cover if you have to play it note-by-note? Again, if the song really calls for it, I'm game. But if not, there is no reason why anyone can't be creative and spice it up or change some non-essential things.