I admit to coming late to these. I've listened to the Ballades, Scherzi, the Etudes, Polonaises, etc. since childhood, but I've just gotten around to the Nocturnes.
Nobody questions the masterpiece status of them - except, I just don't get them. I can't seem to understand them at all. I don't see the point of most of them. I don't hear any amazing melodic content - unlike so much of other Chopin. I don't even hear any surprising harmonic twists - again, typically found in a lot of other Chopin.
How many of them can you listen to in a sitting? After two or three - I'm done. Can't take another note of them. They seem to be all in the same dreary, deadening mood, filled with a lot of bitterness, and no great tunes.
Where have I gone wrong? What should I be listening to or for? What, for you, makes them great?