Who is westlife and why should we care. : ) best selling artist in what country and what decade. As I have never heard of them they can't be that great or they would be a recognized household name. : ) .this is like saying- blackwell's best dress list says your outfit is the tops while no one in the real world cares who blackwell is or what he says. : ). In other words your opinion or the group that has said this group is the best of the decade is only one viewpoint.: ) . Sort of like asking what flavor ice cream everyone likes.even though most people like ice-cream they are likely to choose different flavors do to their personal taste. : ).