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Recommendation is rated by criteria below. 

I rated from point of view whether the album is suitable for beginner.

So, rating is low if the album is masterpiece for expert of prog rock but too eccentric for beginner. 

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Rating Criteria
S Masterpiece which is representative of the world of progressive rock.
A Representative work of the artist. Suitable for beginner.
B Very good work but not the sound of golden days of the artist. Better to listen after S and A.
C Not good. Better to listen after you become fanatic of the artist and have tolerance to accept any sound of the artist.
D Buying is waste of money, listening is waste of time.