I sometimes like one block or quilt in a series much better than the others. When that happens I pm the person. Otherwise the other posters will have hurt feelings. If I really hate a quilt or block I don't post.
When I was showing off the first quilt top I designed and pieced all by myself (and I was very proud of it), I mentioned that two of my blocks weren't exactly straight across from each other on either side of the sashing. One of the people that had looked at it when I displayed it said, "I noticed that." Here I was hoping this 1/2 inch difference was lost in the overall wonderfulness of the design. (Each block was 15" square separated by 5" of sashing all around.) I wish she had kept quiet. Now I am wishing I had corrected it, even though it would have meant repositioning every block in that lengthwise strip. Now it seems like this is a glaring error and I am not as proud of the quilt as I was.
I will never point out any errors in any other quilt I make in the future.