For show, no. Duckwings are showable but too much melanizer makes more black in the plumage. Like this boy - He should have pure yellowish whitish hackle, saddle, and plenty color on the wing but doesn't.
Otherwise it's fine if you are not planning to breed for show, most don't.
Great news - My gal Josephine is a mommy!! She's been sitting on a large quantity of eggs for quite a while now and just this morning, a little double tufted blue cuckoo chick's head was poking out from under her breast. Carefully lifting her up, she's got two more chicks, both yellow with faint stripes, and several more eggs some pipped under her. I'm very excited! So far she's being a great mom too, still sitting and waiting for the rest. I'm assuming the yellow chicks means my blue cuckoo boy is actually hiding a recessive (Wheaten?) gene. The chicks are pretty yellow.
Otherwise it's fine if you are not planning to breed for show, most don't.
Great news - My gal Josephine is a mommy!! She's been sitting on a large quantity of eggs for quite a while now and just this morning, a little double tufted blue cuckoo chick's head was poking out from under her breast. Carefully lifting her up, she's got two more chicks, both yellow with faint stripes, and several more eggs some pipped under her. I'm very excited! So far she's being a great mom too, still sitting and waiting for the rest. I'm assuming the yellow chicks means my blue cuckoo boy is actually hiding a recessive (Wheaten?) gene. The chicks are pretty yellow.