What's the big deal regarding the second movement of the Fm concerto? Sure, it's beautiful, but IMO it's the least interesting movement of both the concertos. I don't think it can hold a candle to the middle movement of the Em (which is just sublime). The rest of the Fm is pretty awesome, possibly even better than much of the Em...
I think when asking a question like this it's very important to recognize the immense differences between early Chopin and late Chopin. I'd say, starting from Op. 52, every subsequent piece is remarkably profound on so many levels. When I first listened to the Op. 58-3, I thought it was remarkably tedious, but after a few listens I discovered just how profound it is. Early Chopin rarely finds such depth (I'd say his first real masterpiece was the 1st ballade), but the beauty exists in an entirely different form. Among his earlier works, though, I especially love Opp. 10, 11, 13, 14, 15, 16 (VASTLY underrated), 19, 21.