I don't agree with what most people say against Sasuke but will explain why. It's just another point of view, nothing to fight about, please.
I took Rei Uchiha's post as an example as it was so complete. She does have points but there are reasons for which they do not matter to me as I always find a reason for things to be as they are.
1. he is a cruel anti social elitist, always mentioning his "blood superiority" to Naruto (btw i was soooo happy when i found out that Naruto is 4th's son)
Neiji too and no one hates him for that! Naruto also thinks he rocks, but looks nicer, that's all (I'm awesome, he says).
Plus
it was Konoha's fault for Sasuke to feel superior, remember how boys treated him the first day at school, and girls looked at him. Remember how people from the different countries gathered at the chunnin exams especially because of Sasuke as they had never seen an Uchina fight for a long time.
2. he is a traitor, abandoning his friends, his sensei and most of all his country!!!
3. he went to Orochimaru, who btw attacked Konoha and killed so many people, not to mention the Hokage
He was just 12-13 years old and
under the spell of a cursed seal. And he never meant (when he went away) to do anything against his country, just wanted to kill Itachi. BTW, Naruto wants to revenge Jiraiya, onlye one man. Imagine what you'd feel for the murder of a whole clan.
4. He then killed orochimaru, who made him super strong.^
I actually loved him for that! Oro got what he deserved, and Sasuke showed no one can brainwash him if he doesn't allow it: Sasuke had always been aware of the fact that Oro was training him for
that body to become strong, as he was planning to use Sasuke as his future body, he was not a real sensei, he was more of a dictator. Gave Sasuke a cursed seal so he would not be able to feel another thing but the will to kill.
5. He killed Itachi, still remembering what happened when he was a kid, but he never tried to actually find out more about that day by asking elders, anbu and others.
He killed him
because he remembered what happened when he was a kid, Itachi had made a very good job at playing the mass murderer role. Remember he even went as far as saying "My eyes, my eyes!"
6. He had the nerve to even wear Akatsuki's cloak!!! after he was told by Tobi/Madara the truth about Itachi (i know it might not be true but he believes it and he seeks for revenge...AGAIN)
Madara did not wanted to give him an option, and Sasuke could feel it. Madara said "We share the same goals, now the Hawk and the Akatsuki move as one." He didn’t even ask for an opinion. (bottom of page)
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7. He attacked 8 tails and surrender him to Akatsuki, fully knowing of what will happen next to him U_U^
I doubt he knew, remember he didn’t even know what a tailed beast was, Karin explained this to him .
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8. He abandoned Sakura in a disgusting way
It did break my heart, too, but Sasuke had never shown any interest in her.
9. He was about to stab Naruto the first time he saw him after 3 years!!
Still under the effect of the cursed seal and after 3 years of living with sweet Oro, any other outcome would have been unrealistic. It was some manga after the seal was removed from him that he cried at the memory of Team 7.