Why am I in this situation again? First one to rate & review and my honest opinion of the book is like 1-2 stars out of 5. Only this time I promised a review in exchange for a digital copy and I feel bad if I don't post, but also don't want to post

To clarify: the only reason I don't want to post is because I don't want to be the only reviewer and give a low rating to an indie author at the beginning of their career. I hate being the only reviewer of a work. Hate it!