5 hearts – I loved it. Nothing less can do and it hit home on every page.
4 hearts – Really liked it and would read it again.
3 hearts – Liked it and might read it again. More of a comfort read.
2 hearts – It was an alright read.
1 heart – Did not like it and would not recommend it.
I use .25, .50 and .75 as well, because sometimes it is an almost number, but something is still missing, yet it is not “bad” enough to downrate it so much.