Khimyoya If you write 100 percent honestly, then the author will be offended. Since this society is based on "equal exchange", then with an "honest review" you, as an author, will receive the same or even more caustic review.
Moreover, the swap review does not always work as you want. You will give 4 stars and you will be given 2 stars. A swap review is not an equivalent exchange, though. Much depends on the reader himself. Some believe that they are superior to others, that they can break the unspoken rules of the game. This is all the real world.
Then you need to ask for an objective review, honest, provided that the reader is really honest, unbiased and you, as an author, are ready for such a review.
Moreover, much still depends on the professionalism of the reader himself. If he has knowledge of how to write, he will give you more valuable advice than a non-expert reader.
On the other hand, if this is an honest, objective review, then you can learn a lot from it when we master the novel. Correct mistakes, rewrite history and it will become interesting.
But then it is probably better to write such a review on the forum, under the topic, since a rating of 2 or 3 stars will affect the rating.