A quick breakdown for clarity...
Rating... 0/5 - Avoid like the plague, truly awful
Rating... 1/5 - Bad, plain and simple
Rating... 2/5 - You can listen to it, but don't expect magic
Rating... 3/5 - Good. Anything from quite good to really good
Rating... 4/5 - Superb. Truly great tracks get this
Rating... 5/5 - Nigh on perfect. A couple of tracks may reach this level
Rating... 6/5 - Ah, it's Too
Many Walls then?
Like I said, it's rough.