I am a LA quilter and always check the stitching-front and back-with every bobbin used. To have 4 quilts with unacceptable stitching shows that your LA quilter doesn't care about her finished product or for some unknown reason thought you would not mind. Fortunately, most LA quilters are not like that-we know our reputation is in our stitches and customer satisfaction. You should not have accepted the less than quality stitching. It takes a long time to take out stitches but it must be done if there are errors. I would revisit with the quilter and go over what can be done. If nothing, then please don't use this person again.