Rating Scale:
5 stars = 10/10
4.5 = 9/10
4 = 8/10
3.5 = 7/10
3 = 6/10
2.5 = 5/10
2 = 4/10
1.5 = 3/10
1 = 2/10
.5 = 1/10

2.5/5 out of 10 is baseline average, anything above it is considered at the very least listenable and good in my eyes. Aka a score of 3.5 isn't bad, at all.