If a judge gives a "negative" comment, it isn't because he/she does not like your quilt. Judges just have specific things they have to look for. If a quilt doesn't meet that specific criteria, that does not decrease the beauty or value of the quilt. And remember, there will be tons of people at the show who will ooooh and aaaah over your quilt. I have been to many shows in which my favorites didn't win any ribbons, but I loved looking at them anyway.
I entered three quilts in our local guild show last year. None of them had been made with the intent to show them, but I actually WANTED the judges comments so I could see where I could improve. I am entering one quilt this year that I made with the intent to enter it. It may still not win, but that's okay because I will get more judges comments. Also, it really is exciting to see YOUR very own quilt hanging in the show. Oh, and of the three I entered last year...I received a community appreciation award on one, so I know someone liked it even if it wasn't perfect!