I love 'em.... Their first album, Days of Future Passed is a beautifully orchestrated masterpiece, with the obvious highlight: Nights In White Satin... But the whole album, to me, is perfect in its entirety... It's a great break from heavy percussion and big booming sounds...
The next two albums, In Search of the Lost Chord and On The Threshold of a Dream are only slightly less appealing than the first but still very enjoyable... The introduction pieces to both are very psychedelic and extremely cool!
In my opinion, a great band! Great poetic lyrics and beautiful music...
If you like the Beatles, chances are you would like the Moody Blues, I think... But maybe not. It's up to you!