All of Britney's albums have redeemable qualities.
My personal favorites are Femme Fatale, Circus, and Britney but lately I have been getting into Oops! A LOT and In The Zone and ...Baby are just there for me, but I still listen to them because I like them, and Blackout is great, too. I really don't think any of Britney's albums are disposable because she just adds something to them that I can't pinpoint. People come for Britney and what not, but even if she sings just like the demo singers her version always tops theirs. I mean Britney > Ke$ha in TTWE and Britney's HIAM > demo singer. She really does add some spark to all of her albums.
If anything, I'd say her most lifeless album was Circus. Again, I love the album but the vocals for Womanizer, Out from Under, Mannequin, and the like she just seems out of it and not really in her zone. Blackout came off as far more genuine whereas Circus came off as an attempt to regain public appeal/approval.
Britney sounds great and very cute in both the song and the video, ya'll will have to deal. 
