I thought they did a decent job in the one song he posted. They did a decent job. Several other songs like Walk through the fire or Buffy's song 'Give me something to sing about' ? -I'm not sure of the title , are satisfying as far as dubbing goes.To me, french voices are the ones I'm used too and honestly the singing in our french version isn't that bad. ;)
This is why I had a hard time seeing a lot of reactions based on : how awful and wrong!