I think that as in all things in life, we're best off putting our focus on what we do ourselves, not on finding fault with what others are doing. I know my own inadequacies very well. Many times, I think I'm not good enough to sing in front of other people. But if I get past that and stand up and sing, I lose my fear and find my audience is having a good time - and so am I.
Would it be better for me to listen to the real and imagined voices who say I'm not good enough? Isn't it enough, for us to forget all the negatives and just have a good time with the music?