regarding Fitter Happier
If Fitter Happier was in a lesser more inconsistent album. Let say Hail To The Thief, Kid A, In Rainbows I wouldn't really care much about it's presence and just consider it as a short atmospheric interlude that I can gloss over.
However when it is in an album where every single song is a 10/10 mind blowing quality song. It really sticks out slight imperfection