For every author Feedback is critical.
I love stars, particularly the 4's and 5's.
But real feedback in the form of reviews, particularly if there were things you did not like is absolutely critical.
In particular for 1,2,3's give me some feedback in a review. And no, "it stinks" isn't helpful.
Tell me why "it stinks" what do you think I could do better, what would have made the book better in your mind?
That's what most authors want. Yes, as humans, egomaniacs that we all are, we love accolades, but we cannot improve ourselves without constructive criticism.
What every author, paid or free, craves is feedback. Reviews, criticisms. Have an opinion!
I read every single review and take them to heart. I am pretty sure every author does.
I don't know how many times a reviewer (not on goodreads--but Amazon) will say "I know the author will never read this but..." Now, I can't talk to the big guys like GRRM...
BUT I guarantee you every single Indie Author out there reads every single review.
Your voice matters! Speak up! Let us know what you like and don't like.