G

Kishimoto biggest mistake is Naruto Uzumaki himself, i mean making him the solo hero while so many died. Without sasuke, sakura, kakashi, minato and Hagoromo he couldn’t do a damn thing in the war.

Also him constantly breaking the rules and act like a spoiled brat. Making him the only person who suffered, Naruto forgives obito, sasuke, orochimaru and kabuto while keeping prisons full of criminals who did far less crimes.

Making sakura marry Sasuke her tormentor, hinata and Naruto’s marriage makes no sense. The only marriage that actual makes sense is shikamaru & temari, Ino & Sai