I use to hate Itachi in Part 1,he seemed like a total d*ckhead,I mean he killed his whole clan expect for Sasuke,he beat the sh*t out of Sasuke when he got older,put Kakashi in the hospital for who knows how long and wanted to capture Naruto.But even though (at the time)he did all of that he still seemed awesome.
Then in Part 2,when Sasuke killed Itachi,I was like alright,about time,this d*ckhead deserved to died,finally Sasuke got his revenge,now he can return to the village.Wrong then the next episodes Tobi told Sasuke the truth about Itachi,and I was like really,it was his mission to kill his clan,damn he most have been so depressed and conflicted after that.In truth Itachi wasnt that much of a bad guy,suffered alot and live a pretty hard life.