depends on if you are the singer or the observer.
i know a lot of people who are not very good singers but they think they are the cat's pajamas.
it's all about self awareness (i guess)... there are thousands upon millions of people who sing however ...with hubris that will not allow them to understand and develop, in earnest.
people who are aware of their inability to sing, seem pretty content with the fact and have no desire to improve. (which could be a better feeling, imo).