I use Symfonium to do the same thing.
My rating system is a bit loosey goosey because its hard and tedious to catagorise music into more that 5 levels. Its mostly defined by how much/often I would listen to a song because that seems like a good base line.
Songs sonetimes get upgraded / downgraded on the fly and then siphon in / out to the respective playlists.
- 5 star: high energy, 99% wont skip, will listen to hundreds of times again
- 4 star: any energy just a good song, will listen to many times again
- 3 star: indifferent, might be a hit on the right day in the right mood, wouldnt listen to more than once a week
- 2 star: not for me, can understand why others might like it, wont make it in to any of my playlists
- 1 star: absolutely fucking not, mark for deletion (hyper commercial pop like the overplayed shit through the 2010s mostly fills this category)
Put it this way, Im not deleting songs that I dont like that are part of good albums.
I dont have any 1 star songs currently and barely any 2 stars because I just dont download those artists