Tolkien is an amazing writer. I enjoyed reading his books, especially The Hobbit, the Lord of the Rings, and the Silmarillion. If you are a Tolkien fan, then, you should read this at least once. Even though it does not flow and hold your interest like The Hobbit or The Lord of the Rings, it still is a good read. This book is a collection of short stories as well as some of Tolkien's notes from the Battle of Unnumbered Tears until the destruction of the Ring. True this book is not like his previous novels, but you will certainly love it. You will want to read it more than once.
Also recommended: THE USURPER AND OTHER STORIES, THE LORD OF THE RINGS TRILOGY, THE END OF THE THIRD AGE, DISCIPLES OF FORTUNE