Sasuke is easily influenced, since his mind was fucked by Itachi from a young age. Itachi said so himself, Sasuke could easily be painted any colour since he was blank, unfortunately Tobi came to him first. If Naruto retrieved him after Sasuke's fight with Itachi, Sasuke could have turned back to Konoha. I don't think it's Sasuke's fault he's obsessed with revenge, his life was screwed up from a young age. He had a nice, loving family and it was taken away from him by his own brother, who he loved. Can you blame him?
Tons of people start to hate Sasuke because of the retarded fanboys that constantly try to make him seem like he's a king. They make up stuff that wasn't stated in the manga and continuously annoy everyone else. Typical fanboys, most fanboys do that. Naruto fanboys ruined Naruto's image for me.