Numbers are not a good way of thinking about and categorising music period. Place too much of an importance on them and it will damage your interaction with art. Every album can offer an individual experience, and culture pieces together to create a living ecosystem of music, these things are lost when pitting everything against each other in unncessecary games of numbers and power rankings. There is however a lot of music out there and high numbers are a quick and easy way of highlighting attention to things, I hope you don't take my ratings seriously and potentially find them useful in exploring music. If I have written reviews for an artist: prioritise those words over whatever number I assign.
That being said, ratings are on a scale of 1 to 10 with increments of 0.5. Anything rated 6 I recommend, things rated 7 showcase much uniqueness, 8s very much so and I'd consider these essential listening. Things rated 9 and 10 are exceptional masterpieces. Some things are unrated because I either haven't listened to them or I think it'd be inappropiate to rate.