The worst plot no jutsu was Kurama vs Naruto to gain KCM! this guy fought 6 bijuus and get defeated by simple shadow clone and sage mode trick!U_U
I didn't interpret it that way at all...
While I abhor using urban terms, Naruto does possess a few twists I've interpreted as plot holes or inconsistencies that I suppose compares to this "plot no jutsu" or whatever you are calling it.
There are a few in the Sasuke vs' Itachi arc. The first was when Sasuke escaped Deidara's final blast when it was shown that he was out of chakra, yet he was somehow able to still activate the sharingan again, cast a genjutsu on manda and hide inside of him all in a matter of moments. The best I can think of to explain this would be Sasuke using his curse mark, but that's all I've got lols.
The second was when he used lightning and nature energy from the sky rather than using his own chakra to create Kirin even though he neither knew senjutsu nor even used his curse mark. The best way I can explain it is his chakra stayed in the clouds and he converted it, but I'm fairly certain Zetsu stated he used energy from the atmosphere.
Next is one from the five kage summit arc.
Itachi stated Koto Amatsukami was one of the ultimate genjutsus that permanently brain-washed someone, yet Mifune was able to reject it and reverted back to normal rather than being enslaved.
Next are a few from the war arc.
The seven swordsmen of the mist were legendary and thus implied to be strong, thus I was expecting a whole arc for them in the war and for them to be Akatsuki level, but they were cut out and easily defeated for some reason when Zabuza took an entire arc to defeat at the start of the series and Kisame and Suigetsu possessed otherworldly justus, weapons and chakras.
Izanami was a decent twist, but it didn't make much sense to me since it was made to counter Izanagi and thus manipulated reality and permanently left the user blind. Problems with this include Itachi not requiring Senju DNA like Danzou and Obito did with Izanagi and his eye going blind when he was an edo tensei. Furthermore, the technique kind of came out of nowhere regardless of the foreshadowing of Kabuto claiming to be Orochimaru rather than himself and seemed to possess only certain circumstances to be useful.
Those are about all I can think of for now but I believe there's a few more that caught my eye.