The most rewarding thing a reader can do is find a reviewer with a similar taste in books, and who gives an honest review. It's the same as having a good friend who knows instinctively what books you like.
I worked in a charity bookshop for 12 years cleaning and pricing books, so ended up buying shelves of books. The girl I worked with commented that if she was housebound I would be the only person who could go to the library and choose a book for her!