One thing I do know however, is that sometimes weird music grows on you. I've listened to albums and initially hated them, and then after listening to them more I started to really appreciate them. I think I kinda felt that way with In Rainbows at first.
The music on The King of Limbs
isn't any more advanced or difficult than what the band has been doing since 2000; it's just less dramatic and melodically rich, IMO. An eight-song album is too short to afford two or three cuts that are essentially glorified rhythm tracks. Of course, Radiohead astutely compensates for the diminution in quality with a reduction in quantity, so we have that consolation.