Nerds_feather
Purveyor of Nerdliness
My husband regularly takes months to read a book. It's because he pays attention. Anyway, a reviewer can write what they like. They are the audience. People can walk out of Waiting for Godot and say nothing happened whilst another can get to the end and call it a marvel of wit and satire. A reader can say it took me eight months to read the book because it didn't hold my attention.
THIS. Readers are under no obligation to like or mince words about a book they read. I personally do try to be fair, and don't do "hate reviewing." But if a writer (or director or artist or game developer) thinks they are entitled to praise alone, they are in the wrong business.