Gather round, because it's time to drag the cast of Naruto. Even the protagonist isn't immune - yes, that's right, Naruto Uzumaki is among the worst characters in Naruto. Why? Because he went from being a plucky shonen protagonist with a huge heart to being a terrible father and a terrible leader who has zero interest in effecting real change in the terrible system he now controls.
Naruto is far from the only awful Naruto character, however. From major characters like Sakura Haruno to forgettable and annoying filler characters like Yota and Guren, there's plenty of criticism to go around.
It's not that these characters are unredeemable. A lot of them actually have good traits, and are likable or even lovable from certain angles - but here, the focus is on their very real flaws.
There are good villains with compelling motives, and then there's Danzo. This power-hungry coward forced a traumatized thirteen-year-old to massacre his entirely family, then stole all of their eyeballs and embedded them in his ugly, withered arm. Danzo might not have sucked so hard if Naruto didn't provide unnecessary flashbacks about how he felt inferior to Hiruzen as if that's supposed to make him seem sympathetic.
You know what's not a great idea? Trying to seal a beast into an unborn baby, then acting surprised when the mother doesn't make it past childbirth and the kid can't control his horrifying powers. Rasa treated his wife and his children like experiment fodder, then tried to deal with the problem he created by sending assassins after his own son. No wonder Gaara is so miserable.
Sakura Haruno is widely hated by the anime community because she's perceived as weak, shallow, and selfish. There's also her generalized cruelty toward Naruto, and her total lack of understanding of why Sasuke - the person she apparently loves enough to marry and have a kid with - doesn't exactly appreciate the government organization that ordered a hit on his family. Emotionally supporting your loved ones, what's that?
Kaguya Otsutsuki is technically the ultimate villain of Naruto, but her backstory is so fantastical and ridiculous that it's hard to take her seriously or care. When your first ultimate villain is as much of a BAMF as Madara, anyone that comes afterward is going to seem lackluster. Sorry Kaguya, in a different series you might have seemed cool, but you were part of a poorly paced and convoluted ending that barely made sense to even the most die-hard of fans.