I guess It's Hard is the default bad Who album. I like the singles from it though. Not a fan of Who By Numbers though. So that could be my slightly controversial pick.
Leaning towards saying Oczy Mlody for The Flaming Lips. Maybe some of those early albums are worse on some levels, but I'd still rather relisten to them then relisten to the new one.
I skipped out on hearing some of those late 80s Cooper albums in their entireties, what I've heard from them is pretty awful. As far as the more classic run albums go I was never that into Lace and Whiskey, it's pretty forgettable.