My star system is available to publishers when I have read and reviewed their galley. And, sometimes their departments write and ask for further details or tell me when and where they will be posting another galley for review. I read on the days I am not working. And, set up my stock pile, so reviews appear even when I am not actively reading.
If I review a book, I give an honest review of my thoughts. If it's an advance reader copy (ARC ) the actual review page will have further details in the FTC section. I try to connect my readers to a description/ synopsis of what the book is about, my thoughts, and links to the author or a photo from the galley packet.
1 star: strongly disliked it
2 stars: did not enjoy reading
3 stars: occasionally enjoyed it
4 stars: really enjoyed it
5 stars: adored the writing, plot, message, or perhaps I loved all of it.