I think you should try to give us a picture. it will help us with suggestions. there are some very good points made in the message board about using LAQ's and making sure your expectations and the vision of the quilter match before you leave your quilt with the quilter. Sometimes it is the thread used rather than the allover design.
I do think talking to the machine quilter is a good idea too. maybe there is something that can be done to make you happier with the work.
One thing i can say with fair certainty...your son and his wife will appreciate the quilt and will not look at it with the same critical eye that you have. They will want to use it and wash it and those stitches will not be as evident to them as they are to you.
Lisa