I'd place Kakuzu above Sasori.
Sasori at least had meaning to his defeat, and his death brought information to the next arc (Orochimaru)
Kakuzu was literally trolled by his own power and Shadow Clones, and was used for nothing more than target practice for Naruto's new technique.
Transforms into a long range form and immediately jumps into close range.
Tries to kill a Jinchuriki, when you know, that's the one thing Akatsuki shouldn't do.
Comes back as an Edo, two people he fodderized in the past, pulled a surprise attack and fodderized himself
Tenten solo'd 2 of his masks.