My evaluation system:

5.0 - Personal favorite with abundance of emotions. Almost flawless.
4.5 - Inspiring, magnificent. I could listen to it for thousands times!
4.0 - Very good and memorable. Give it a chance, and you will not regret it.
3.5 - The album, which has more advantages than disadvantages. Highly enjoyable.
3.0 - Decent and it's enjoyable enough to give a CD few more spins.
2.5 - Mediocre. Just your typical post-rock or ambient album. It doesn't move your emotions.
2.0 - Boring and kind of unimpressive.
1.5 - Unworthy checking.
≤1.0 - Annoying in every possible way. Dull, embarrassing and pathetic.

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