I had much the same reaction, but I think it was a very well done cover and appropriate song no less. I wouldn't mind hearing more ballady stuff from Nightwish, in the vein of Sleeping Sun or Walking In the Air -- as long as it doesn't get too close to the 80's hair band ballads. Mind you, Sleeping Sun was the first Nightwish song I ever heard, played to me in her car by a friend who picked me up from the train station when I served my country in 2000.