Honestly, I don't mind hearing about an artist's/writer's concerns--I'm curious to find out about their creative process and sometimes wonder if they dislike the same things I dislike. I want to learn from them.

Having said this, though, I hate it when it becomes a pattern in an arist's/writer's work--when they rant about it every time their work is presented or published. (For example, I love the web comic Megatokyo, but I have almost stopped reading the writer's comments because he denigrates his own talent so much. And over the same small problems which I don't think detract from his work at all.)