Just downloaded it myself. So far I like what I hear. It doesn't have that 'right out of the box' accessibility that The Bends or OK Computer has but I still think I like it.

It took me numerous numerous listenings to appreciate Kid A, Amnesiac, and Hail To The Thief, but I ended up at first appreciating and then really liking all three.

I hope Rainbows is the same.