I haven't been quilting very long, and heaven knows mine are not the best, but if I were to enter a quilt in a show I would look at it as a learning experience. Whatever the judges criticized about mine, I would go and work on that particular aspect of it and hope to improve my quilting in the long run. It's hard to see your own shortcomings but are able to understand them when someone else points them out to you. You can't be thin-skinned if you really want to learn how to improve yourself.
All that said, your quilts are beautiful. Now take their advice and work on your binding. Your next one will be perfect because of this.
Best of luck in the next show!