I think it depends...
When I was a very new quilter I volunteered to help make a quilt that the local Make A Wish chapter had requested for a fund raiser. I thought I would be learning a lot from the other quilters, who were far more experienced. We picked out the fabric as a group, and somehow I was the one who figured out how many blocks of each type we needed for the size quilt we wanted, put together packets of material for each member of the group, and distributed them. The blocks were returned to me, and suddenly everyone else was too busy to help putting them together. Some of the blocks were perfect, some needed just a little help, and one set of blocks were so badly done they couldn't be used at all. I was pretty sure those came from the oldest member of the group, whose eyesight was failing. So I took those blocks apart, reused the fabric when possible, or cut new pieces when necessary. I never told anyone, because it would have been disrespectful and there would be nothing to gain. However, if the blocks had come from a new quilter, I probably would have mentioned the problem to her privately, so that she could learn. That is what I would hope someone would do for me.