My rating scale:
5 stars: Right up there with the greatest albums of all time
4.5 stars: An Excellent album, one of my absolute favorites
4 stars: A Very good album,Something I'll return to again and again
3.5 stars: Very decent, something I'll enjoy a few times
3 stars: An average record, though still possibly good
2.5 stars: Below Average, though some potential shown
2 stars: Severely flawed
1.5 stars: Horrible, but with SOME redeeming value
1 star: Atrocious
.5 stars: Unlistenable