He is simply written that way, but that doesn't mean he's written right. The one thing that prevents the character of Itachi being completely perfect is his one defect...preferring to work alone. That's it. And it barely even passes as a bad thing. His defeat to Sasuke is just another matter to hype him for, showing that a severely ill Itachi holding back gave his brother a very high dif win. And the Kabuto one...geez, Izanami is so obviously phoned in. While its usually the other way around, in that one occasion, plot itself decided to bend in and give Itachi a never mentioned before technique that fit in exactly the situation he was in...you cannot say that was not an asspull.
And the worst thing is that Itachi was so close to being my favourite character in the series. So close. The one thing that changes this entirely is that Kishimoto decided that, to the end, Itachi had to be perfect. That is the very reason I appreciate Shouto Todoroki (Character in both my signature and avatar) so much. He is very, very similar to Itachi...except everything I came to despise about this character turned into appreciation due to very small details added in by the author. It is amazing how different my opinion towards them both stand considering how similar their personalities are.
