I don't buy music if I don't like the whole album.
Simple as that.
I do have favourites among them though, here are a few.
Silver Jews: Lookout mountain, Lookout Sea
Grandaddy: The Sophtware Slump
Man or Astro-Man?: Experiment Zero
The Mountain Goats: We shall all be healed
The Decemberists: The Hazards of love
The Devastations: Devastations
The Drones: Wait Long by the River and the Bodies of Your Enemies Will Float By
Smog: Red Apple Falls
The Weakerthans: Reconstruction Site
You picked some really weird choices from some bands I really like.
For Silver Jews I would have said American Water
For Grandaddy I would have said Sumday
For The Mountain Goats.. really all the albums have huge weak points, but I guess I'd pick The Sunset Tree. I just can't listen to an entire Mountain Goats album straight through.
For Decemberists I'd take ANYTHING but Hazards of Love. God, that album is weak. I've only seen them once in concert, but that time the only thing they played was the entire Hazards of Love album straight through. Ugh.
I see what you're saying. But these are my choices

Typically I'll que up a catalogue of an artist, rather than an album on its own.
But for this exercise, I was cherrypicking rather than blanket catalogue.
Yes, the Hazards of love is the weakest record overall, but the album has a theme and I find that I have to listen to it from beginning to end. The rest of their catalogue(that I own, haven't got the latest) I'll go to Mariners revenge and Leionairre's song.
Occasionally I'll listen to Picaresque all the way through. Hazards has kind of poor production value.
Mountain goats... these days I don't listen to them as much, but I stand by my choice. Palmcorder Yajna, Slow West Vultures and Against Pollution are great. I've seen them twice and really enjoyed both shows.
Grandaddy can't do any wrong in my opinion. I love every song.
Everything by the Silver Jews is excellent, but I can't listen to the Arizona record, because the production values and performances really let the material down.