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Naruto's final portion of the story had a lot of reasonable criticism, and Sasuke's character arc after Itachi's death could be one of the best examples of that. Sasuke has always been popular, and his character was strongly written by Masashi Kishimoto for years, but after Itachi died, it seems that the younger Uchiha brother became a very aimless deuteragonist without a proper direction.
This isn't exclusive to Sasuke because Naruto as a series had a lot of bad moments in its final portion of the story, but his being one of the main characters makes it all the more annoying. His motivation during the bulk of the series had been killing Itachi, and once that was done, it seems that his role in the story was mostly what benefited the plot or just to keep him busy.
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Disclaimer: This article contains spoilers for Naruto.
Sasuke's character declined in Naruto after Itachi's death
Before Itachi's death, most Naruto fans agreed that Sasuke was a very strong character, and his progression made a lot of sense. He wanted to kill his older brother because the latter slaughtered their entire clan, and once they met for the first time in the series, Sasuke realized that he hadn't grown strong enough and decided to leave the Leaf Village with Orochimaru to gain power to fulfill his goal.
All of this made a lot of sense, and while Sasuke in Shipudden was certainly colder and more distant, he remained a good person as he didn't want to kill on a whim and even formed a new team with Orochimaru's misfits. He eventually found Itachi and fought to the death, and that is when things started to fall apart with his character.
Tobi, who was actually Obito Uchiha disguising as Madara (it's complicated), reveals the truth to Sasuke: that Itachi was a good guy, and his killing the Uchiha clan was because the Leaf Village ordered him to so they could avoid a potential inner war. This changed Sasuke's outlook on the situation, and he decided to destroy the Village, which, in a way, made sense, but Kishimoto didn't handle things properly.
The problem with Sasuke post-Itachi's death
The problem with Sasuke after Itachi's death, and this is a running issue of Naruto in the final third of the series, is the lack of consistency. Once he discovers the truth about his brother, his personality and decision-making become very inconsistent, and it seems that Kishimoto wasn't sure if Sasuke was going to be an anti-hero or a straight-up villain moving forward.
At first, it made sense that Sasuke would become a murderer and a villain because of the shock to find out that his brother had been forced to do what he did. It's all well and good, but then Kishimoto decides to bring Itachi back, and the latter tries to talk him out of pursuing revenge, which makes the younger Uchiha's decisions in the final battle against Naruto all the more questionable.
It seems that Sasuke didn't know what he truly wanted, and his character made constant flip-flops that have hurt his legacy over the years with anime fans. Some people have argued that it made sense because he was a traumatized teenager, and while there is some weight to that theory, it doesn't excuse bad writing for a character that was so important to the story and who had been fairly consistent before even though he was already traumatized.
Sasuke as a character made a lot of sense in Naruto right until the point that the truth about Itachi was revealed, and it could be argued that Kishimoto wrote himself into a corner. Everybody knows how important Sasuke was to the plot, and now that his main motivation was done, it seems that the author wanted his cake and eat it too: keep him as a good guy/anti-hero and have his final battle with Naruto, which felt unnatural in the way that it ended up taking place.
Final thoughts
Sasuke is one of the most iconic anime characters of all time, and that isn't likely to change, even if his characterization at the end of Naruto didn't do him any favors. However, there is no denying that such a rich character had such a decline after Itachi's death.
