When first I came to GoodReads (and once or twice since), I added a few books without writing reviews. I have made a commitment not to do that sort of thing anymore and to post a review -- even if as brief as a line or two -- on each book I read and rate.

I am also going back and reviewing any book I listed as read, as I have time. Previously, I have mentioned the idea that writing reviews, of being critical, can make one a better writer. If you do or don't like a book, put it into words. It will help you recognize the failings (or successes) of your own efforts.