Nerve-racking though they can be for an awaiting author, reviews are, in general, immensely valuable. I say in general, since clearly, there is a relationship between the skill of the reviewer and the value of his or her review. Nevertheless, all reviews are capable of, at the very least, providing food for thought, for both sides of the coin.
Though reviews are, I presume, primarily for the benefit of prospective readers: what author can truthfully say they are quite disinterested? Human nature is typified by a hunger for approval. What joy, what comfort, a word of praise can bring! For an unknown author, these few words may be all the reward they get for months, even years, of effort. On the other hand, if there’s room for improvement, how vital it is to be steered in the right direction!
For readers, choosing a book can be made much easier by the words of guidance of an intelligent reviewer: particularly, one on your own wave-length. What time, disappointment, and money can be saved, by following the wise advice of another.
Congratulations to all good reviewers! You deserve it!