Fully agreed here.
In the anime (not sure about the manga) Kakuzu just stands around choking Chouji and Ino while Shikamaru is frantically dodging and Kakashi is fighting Hidan. If he'd just killed them it would probably have won them the battle (and it wouldn't exactly have been out of character. The man is a cold killer), with Shikamaru and to a lesser extent Kakashi being emotionally distraught.
Also, though I'm fine with Shikamaru beating Hidan, that BS with switching the blood to fast for Hidan to even see? That's just... not good writing.
And what about Pein's latest fight? Does anyone else find it suspect that, when he's regained full mobility for the first time in YEARS, he'd just stand around like an idiot waiting to be ambushed? And NOT NOTICE the chakra presence of a goddamned SUSANO'O?
I'm a bit pissed at Kishi's handling of Akatsuki in general, really. Nice to see I'm not alone.