It is funny you posted this because I was thinking of this topic today. I am a pretty new quilter and I am very hard on myself. I see the quilts my mother and mother in law have made and I think about how I will never be that good.
Lately, I have been looking at their quilts more closely and I am finding mistakes that I didn't see before, as an non-quilter. Things I never would have known was a mistake until I looked more closely or gained quilting knowledge. It was a relief to see mistakes made by people who have been quilting longer than I have been alive.