About my song rating system:
1-Filler
2-Uninpired, boring
3-Somewhere in the middle, if you really like the artist you could probably give it a 4 or vise versa a 2 .
4-Good or even a Hit.
5-Personal Favourite
*Of course, a 3-point rated song in a 4.0-point rated album is way better than one in a 2.5-point album

About my album rating system:
0.5-1:NO
1.0-2:No
1.5-3:no
2.0-4:The bad outnumber the good.
2.5-5:Average,fans will probably like it, as for the others some may like it, some not.
3.0-6:The good outnumber the bad
3.5-7:A Good album, really liked it
4.0-8:Maybe the best album the artist has to offer
4.5-9:Among the best of the entire genre
5.0-10: Only my favourite albums get this or classic albums

I lsten to the album 5+ times and after a month or so I rate it. The final score is: total points/number of tracks BUT
i) Songs must be at least 2 minutes long or they don't count
ii)0.5-1 star plus or minus depending on the overall "feel" I get from the album.