I also tend to like most of the Pottery Barn quilts - there's something about them.........
Why not turn a negative into a positive and make a copycat Pottery Barn quilt and show her or even give it to her. Their quilts are usually SIMPLE patterns - squares and rectangles. I think you could find similar fabrics and the quilting on them is usually simple as well. Just a suggestion to help you feel better and show your SIL that you can make things that look "store bought"!!!