Actually if you listen to the song none of them sound weak - imo at least. Mano sounds stronger than I ever heard her. Nakky doesn't make her voice squeaky. And Mai sounds fierce. Give the girls a chance.
But I'll definitely agree with the people that say naming a group after a classic/"legend" group is a cheap marketing trick. If you cover both of your ears you can maaaaaaybe hear a sound similar to Pittari X'mas...