At times, I've sent in Amazon reviews.
However, I never rely on those reviews if I want to learn more about an artist - especially one that's a bit popular. This is because there will be plenty of people who will bash an artist just for the sake of bashing them. And, as I wrote above, negative comments always garner more attention and many pathetic people love that attention. Some will be negative due to a backlash. And some will be negative (even on Interference) because an album hasn't lived up to his/her own bizarre expectations. So I tend not to judge any artist by the reviews/comments of others. I may accept a recommendation and listen to a new artist, but whether I like an artist or a CD is up to my own personal taste.