I have a friend who wouldn't bring her quilts to guild because she was afraid people would notice her mistakes. I opened a quilting magazine that i had just looked at, showed her a quilt in it, and asked her to take a good look at it.
She saw what I saw - points not matched. Not off by much, but noticeably not matched. The quilt was still beautiful. She had "aha" moment and brings a quilt in now and then for show and tell.
However, I can only notice stuff like that in a picture, and even then only if I think I might like to make it. It's part of the decision making process. My brain has to figure out how complex a quilt is before making a decision to make one. That has saved me a lot of grief!