From Jennifer:
I think we rate books differently. To me 3 stars is okay. 4 stars is I like it. 4.5 I like it a lot. And 5 stars is rare it means I absolutely love it/perfection. I think I have given 5 stars to maybe 5 books this year so far (out of 46 or so). I don't give 5 stars easily.
I think 3 stars is a decent rating. There are plenty of authors I gladly read again but only give a 3 star rating to. Most those books would get a 3 1/2 if there were a half star option and why I'm more bothered not having the half star in the 3 stars ratings.
4 stars is a very good rating from me, especially as I give few books 5 stars. I think I've given fewer books 5 stars this year than you have. Since 4 stars, to me, is a high recommendation I don't mind as much not having the half star.
I would say we think pretty much the same about the rating. I just think I'm less generous than you are.