Here is an explanation of my rating system that I use for my (book) reviews:
Rating system: (stars)
5 – Excellent! Can’t put it down! Fabulous product!
4.5 – Fantastic! Definitely a keeper
4 – Compelling, A page turner, Really very good product
3.5 – Very Enjoyable, very good product
3 – Enjoyable. A pleasant read, good product
2.5 – Take it or Leave it. May or may not finish, not the best product
2 – Problematic. May struggle to finish, poor product
1.5 – Severely flawed. Pass on this one, disliked product
1 – Couldn’t finish. Not my kind of book. Strongly disliked product