On a different note, share the artists you own that DON'T sound good

Use whatever parameters you pay attention to. Timbres, dynamics, clarity, imaging, soundstage, top-end, mids, bottom-end, etc.

In my collection, the artists that (usually) don't sound good are-

Faces

Rod Stewart 

(early) Rolling Stones

(some) Ted Nugent

(some) Eric Clapton

(early) Aerosmith

(early) Beatles

(early) Credence

(early) Doobie Bros

(early) The Clash

Foghat

(early) The Who

(early) ZZ Top

(early) Led Zeppelin 

Janice Joplin

I've probably overlooked some other stinkers in my collection

Thank  God for talented remastering engineers!