Name your favorite artist/group and then pick their best and worst CD.
Genesis
Best: *Selling England by the Pound. *
Worst: Calling All Stations
The best Genesis with Phil Collins is probably *Wind and Wuthering.
*
If you want to exclude Calling All Stations (released after Phil Collins left) then *And Then There were Three *is probably the weakest Genesis album
Electric Light Orchestra:
Best: Out of the Blue
Worst: On the Third Day
ABBA:
Best: ABBA
Worst: The Visitors
Blondie:
Best: Plastic Letters
Worst: The Hunter
The Doors
Best: Strange Days
Worst: Waiting For The Sun (it was their worst effort, but it was still damn good)
Bonzo Dog Band:
Best: Tadpoles
Worst: Let’s Make Up and Be Friendly (the usual flaws of a reunion album – amusing, but not flat-out hilarious like the rest).
Traffic:
Best: John Barleycorn Must Die
Worst: When the Eagle Flies
(It’s telling that the “Very Best of Traffic” Collection has four of the six songs on John Barleycorn and nothing from “Eagle.”)
The Who
Best: Who are You (just edging out Who’s Next)
Worst: The Who by Numbers
I’m not counting the post-Keith-Moon albums. “Not to be taken away.”
Tom Waits:
Best: Nighthawks at the Diner (my personal favorite, although many prefer Rain Dogs or Small Change)
Worst: Real Gone (his latest, which I found way too “noisy” and chaotic compared to his earlier stuff)
Alice In Chains:
Best: Dirt (though Jar Of Flies makes an awfully close run)
Worst: Sap
(I assume we just speak of official releases, that contain new music…elsing my pick for worst would be one of the 23982 pointless compilations their record company has released since 1996…)
I’m assuming best and worst as favourite and least favourite.
Pink Floyd:
Best. Animals*
Worst More** there is some really lame stuff on that.
Steely Dan:
Best. The Royal Scam*******
Worst. Just pick anything post Aja.
***** I know DSotM or WYWH is their best really but since those are tattooed on my brain I can’t see myself sitting down and listening to them these days. For some reason I keep going back to Animals.
****** Since they stopped recording when Roger Waters left. Actually The Final Cut might be the worst but I count that as a Waters solo album.
******* I know Aja is their best album (excuse me, CD) but it’s so slick it hurts.
The Beatles:
Best: So hard to tell b/c there are so many. 
Please Please Me is just as good as Abbey Road depending on your mood.
Worst: Yellow Submarine.
Duran Duran
Best: Rio, although Notorious is my favorite
Worst: Pop Trash, with Big Thing and Liberty close behind
Best: Master of Puppets (Many people will say that their self-titled album aka the black album is the best but I’m old enough to know better. It is easily number two though.)
Worst: St. Anger. Doesn’t even sound like Metallica any more.
Motley Crue:
Best: Dr. Feelgood
Worst: Motley Crue by hair over New Tattoo
The Offspring:
Best: Ixnay on the Hombre. Others would argue for Smash, but I prefer this one with Gone Away
Worst: Ignition It was early stuff but I didn’t like it like I like thier first album.
I’d say Jethro Tull has the highest number of arguably best albums vs arguably worst albums. They either create a timeless treasure, or a festering pile of pigeon carcasses, rarely in between.
That said,
Best Tull: Stand Up
Worst Tull: Under Wraps
STP
Best: Core (although Purple was a fantastic record too)
Worst: Tiny Music (but I refused to listen to anything after No. 4 came out, so Thank You could very well suck more)
The Meat Puppets
Best: Too High to Die
Worst: Golden Lies
Talking Heads
best: Remain in Light
worst: True Stories (listenable, but merely ‘good’ as opposed to otherwise brilliant)
Jefferson Airplane
best: Volunteers
worst: Long John Silver
Patti Smith Group
best: Easter
worst: Wave
Grateful Dead
best: Skullfuck (1971 LP - officially titled ‘Grateful Dead’)
worst: Shakedown Street
Kate Bush
best: the Sensual World
worst: the Dreaming
Peter Gabriel
best: So (an obvious choice, but inarguable)
worst: the one with “Steam”, can’t remember the title offhand. (again, not a terrible record, but not exactly up to his usual high standards.)
the Police
best: Reggett de Blanc
worst: Synchronicity (Sting at the full-flowering of his “I am the most brillliant songwriter of all time!” egomania)
Joni Mitchell
best: For the Roses
worst: Shadows and Fog
Huh? I consider *So *to be one of Peter Gabriel’s weakest efforts. Surely Peter Gabriel I, II, III, or Security can be considered much better albums than So.
*Us *is the album which has Steam. I’ll agree it isn’t one of the best.
As far as the Best…hard to say. The first 3 are so different. My favorite is probably Peter Gabriel II.
Oh, and the Donnas…
Best: Spend the Night just beats out The Donna’s Turn 21
Worst: Gold Medal. What a terrible follow-up album once they found commercial success. I even prefer their pedestrian stuff they wrote when the were in high school to this one.
Pink Floyd:
Best: The Wall.
Worst: This is a hard one. Worst in “fewest amount of great stuff”, or worst as in “most amount of bad stuff”? Percentage or total?
The album with the least good stuff overall is Atom Heart Mother. Just 3 good short pop songs.
The album with the most bad stuff overall is Ummagumma. I skip over the instrumental selections and Ummagumma’s version of Astronomy Domine, in order to get to the genius that is The Narrow Way, Grandchester Meadows and SSoSFAGTiaCaGWaP.
Least good stuff, percentage-wise? Atom Heart Mother, again. While 3 of the tracks are good, they aren’t great.
Most bad stuff, percentage-wise? More. While the songs on the first quarter of the album are truly excellent, the instrumental stuff that takes up the rest of the album is truly horrible.
(For those who think I have something against post-barrett pre-DSOTM Floyd, my second most favorite Floyd album is Obscured By Clouds [yes, recorded after DSOTM, but I think it’s clear it belongs in the p-B p-DSOTM era rather than the Big Four era. Now, don’t ask me what Floyd Era The Final Cut belongs in, I haven’t a clue.]
R.E.M.
Best: (tie) Murmur, Automatic for the People
Worst: Fables of the Reconstruction (it has its moments, but it was largely phoned-in)
Odd, but Fables is the only R.E.M. album I like! It’s dark and moody in spots, lots of the words are indecipherable, and many of the tunes are first-rate. Can’t Get There From Here, Driver 8 and Feeling Gravity’s Pull should have been singles!
It seemed to me they were building up to something on their first works, nearly reached it on Fables, then abandoned it and went in a whole other direction.
Maybe it’s just me.
The Magnetic Fields
Best - “69 Love Songs Vol. 1”
Worst - “I”