Please, please, please don't throw it out. It looks like a beautiful quilt and the quilting looks good. I don't quilt my own quilts but I am sure your quilt be fine with just the diagonal lines. Maybe if you just take a deep breath put the quilt away for some time and work on another project then pull your JL out and start again it will look a little better in your eyes. Even if you finish it and don't like it, I am sure there is a charity or someone you can give it to and the quilt will be loved and treasured. Good luck on your decision.