Everyone has their own tastes, no need to freak out if you disagree with others' picks. And any band is gonna have some bad songs.
Quick replies: Demon... you can make one great album out of the best tracks from the 1st 2 LPs. The rest of the songs are disposable. I'm not familiar with their later stuff.
Agreed Dark Star were one-song wonders
Early Witchfynde is kinda weak, but the last 2 albums are really good IMO
Personally I love the Bollweevil and Aurora singles and the first Triarchy single (2nd one is alright)
OK, here's some I don't like. Some probably shouldn't be called nwobhm, and I know some of them are liked by lots of people, but personally I don't like 'em:
Anniversary
Anthem
Camargue
Earthbound
Hell (sorry, I do not like 'em)
Hoggs
Jodey
Legend (Kent)
Mithrandir
Paul Inder
Urchin
Avalon
Chinatown
Ground Attack
Lautrec
Liasion
Limelight (1 great song, 'Ashes to Ashes', the rest is bad)
Lonewolf (cash for candy)
Macaxe
Nuthin' Fancy
Oxym
Radium
Severed Head
Shock Treatment
Suspect
Taramisk
Y Diawled (sorry, IMO they're awful)
Atlantis Rising
Horsepower
Impact
the Next Band
Rox
Slender Thread
Slowtrain
Tutch
Brunel
Chaser
the Children
Demolition
Die Laughing
Megaton
Overkill
Race Against Time
Requiem
Rogue Male
Shiva
Skitzofrenik
Tracer
Truffle
Agree, disagree, whatever. It's just my list, nothing more or less

"I'm sorry Sam, we had real chemistry. But like a monkey on the sun, our love was too hot to live"
-Becky