I'm a huge Radiohead fan and purchased this album the day it was released.  I listened to the entire album about 10 times the week I purchased it.  I've been lukewarm on it initially but as you say their albums take some time to grow on you.  When In Rainbows came out I was lukewarm with it as well but I absolutely love that album now.
So we'll see.  I wish there were more tracks on it.