What do you do when you dnf an advanced reader copy? Do you still review it? Do you let the author know? (If you got it from them directly)

I very easily dnf books, which means I often also dnf ARCs but I kind of feel bad not giving a review when 99% of the time the issue is with me not the book. The book often isn't offensive or badly written, it's just not for me.

Usually I let netgalley/the author/other-website-I-got-the-arc-from know that the book wasn't for me and I won't review it but now I wonder if I should/could write a review but not rate the book so I don't tank the author's rating. 🤔