They arent bad by no means. Most judges look more for a fuller tight round crest , than the black or blue color to the front.
Some picky ones frown on it, but it is supposed to be the shape more than the color. On the hens it should look like a round tennis ball, not ovaled either nice and round. The roos should go up and then come down in a nice flowing manner.
They could produce show chicks especially if you bought some show birds to breed over them.