At the very least, most negatively critical reviews will anger you into focusing your purpose more and taking off with it. Better criticism might even be able to express
what needs to be changed. Also, it just helps to be able to discuss a piece with a living body. Usually, if they actually say much, it just gets in the way. The act of formulating your thoughts about the
problem with a piece often gives you the solution, and what they say doesnt matter anyway.