First with the thread topic,,,'What You're Doing' is definately a filler tune, but I like it. Still, I challenge anybody to find a worse guitar solo in any song.
Second, I agree pretty much with Kevin. Beatles For Sale is probably the worst album they ever did. Tons of filler stuff here. It did spawn some gems as in 'I'm A Loser', 'Every Little Thing', and 'I Dont Want To Spoil The Party' (a few of my favorites, but your opinion may vary), but in a whole,,,,the albums very patchy. They rushed this one guys and gals.