Reviews are critical to book sales and it doesn’t matter if you get 5 stars or lower. In fact, some publishing experts say reviews look more real if they are a mix of ratings. If you have reviews on Amazon and GoodReads comment on them. Make your comments positive even if the review is not and you will go a long way to building reader loyalty. You even have the opportunity of learning how to improve your next book from the readers themselves. Always take the opportunity to interact with readers and they will remember you the next time they visit the bookstore.