I think the only pop album I ever really hated listening to and told myself "never again" as soon as I finished listening was Sweet Talker by Jessie J.
I agree with Britney Jean being ONE of the worst Chillin With You, Body Ache and what they did to her voice in It Should Be Easy were unforgivable however I'm sure there are worse albums. I love her so much but AKA by Jlo is terrible First Love is literally the only song that's not bad on the album
Stripped? Out of all the pop girl albums? Stripped is one of the best.
I'd say AKA.
It's just overdone.
Also Talk That Talk, the first half great and then it just completely collapses. Same with Pink Friday: Roman Reloaded, but at least that had a great ending.