There were a lot of stupid things in Naruto:
When we had the 9 genins initially introduced as rivals they were portrayed to be somewhat important to the overall story. However, by the end, they just turned into cheerleaders of Naruto with no self drive or ambition.
Shikamaru who was touted to be a tactical genius but was never utilized properly during the final war and kept saying so many times that he "was drawing a blank slate" that it made me question if his entire character had just changed. Kiba being just a watered down version of annoying Naruto, Shino who? and I could go on with the rest. Oh and don't even get me started with Neji and Sakura.
Ironically Hinata was the only one who stayed consistent because her entire character was mainly based on being recognized by Naruto and wanting to be with him, the most evident fact was shown during the pain arc. I think she was the only one to actually achieve her character goal.
The final nail in the coffin was that terrible 4th war:
The other fodder ninjas basically did jack and Naruto was all that was needed for literally everything. Him meeting the sage was okay. Him getting power from the sage was not okay. His entire power was just a cumulation of other people's power in him. This was a mistake that Kishi did from the timeskip when he made Naruto come out of it only a little taller and with a bigger Rasengan, while Sasuke had been wanked and gone miles ahead. So of course the only option left was to give Naruto as much power as possible because... just because and you know, plot.
Minato was a disgrace compared to all the hype he had prior to it. The only thing I can remember him doing was him teleporting ninjas and making up long ass names for moves. Getting his arm cut off, getting his ass beat by six paths Madara. He had a few cool moments but definitely subpar at best.
Madara, well, we never saw him go at full power with both the rinnegans since some other villain just stole the show and ruined it. Madara who was praised beyond any Uchiha since part 1 and we didn't see go full power was just stupid. Naruto being able to heal others like magic was horrible, completely took away the stakes. And then we had Obito somehow come and give his Sharingan to Kakashi, WTF?! Sakura and Kakashi had no business being in the fight with Kaguya in the first place and what happened after was a debacle.
The worst being the ending implications of Naruto as was already said by many in this thread - if you're not a relative of the sage or a Jinchuriki then you're a nobody. Period.