In Rainbows is probably the best straight up song-oriented approach they've taken to an album since The Bends, though even TB felt more cohesive as a complete effort. Still, In Rainbows is some of their most catchy and also emotional material yet. I love it.

My current ranking -

1. Kid A
2. Amnesiac
3. OK Computer
4. The Bends
5. In Rainbows
6. Hail to the Thief

Pablo Honey not worth mentioning of course.