Dynamic range is what makes review scores work; it doesn’t help anyone for 7/10 to mean “barely passable.” (Alas, this view hasn’t always made me a popular TA.) Here is a guide to review scores on this site:

1/5 – Absolutely not worth your time
2/5 – Has some respectable elements, but probably not worth your time
3/5 – Recommended, conditional on your tastes
4/5 – Well worth doing
5/5 – Do this immediately