To me most the Akatsuki shouldn't have died except Kishi wanted to troll them with the worse opponent.
Sasori: Saw through Chiyo's attack but didn't do anything
Deidara: Died because of elemental disadvantage
Kakuzu: Gets weaken by Kakashi then dies because Naruto is the main character
Itachi: Died because of a sickness
Pain: Died because of Naruto's talk no jutsu
Konan: Died because Izanagi is OP
Kisame: Gets the wrong opponent, of all the ninja to fight he gets a taijutsu user, that somehow has a technique that doesn't use chakra
Hidan: The only fair loss in the whole series
Zetsu: ...
Agree-disagree?
Sasori: Saw through Chiyo's attack but didn't do anything
Deidara: Died because of elemental disadvantage
Kakuzu: Gets weaken by Kakashi then dies because Naruto is the main character
Itachi: Died because of a sickness
Pain: Died because of Naruto's talk no jutsu
Konan: Died because Izanagi is OP
Kisame: Gets the wrong opponent, of all the ninja to fight he gets a taijutsu user, that somehow has a technique that doesn't use chakra
Hidan: The only fair loss in the whole series
Zetsu: ...
Agree-disagree?