He thinks he is the only one who has it bad in the ninja world. He SHOULD know better after being with Orochimaru for a few years. I am fond of his character. . Or was. Up until he got the MS he killed off some of my favorite characters, excluding Itachi, but he didn't just spam a few moves as he did it.
He went overboard. He decided to massacre the entire ninja village, which he lived in, for what they did to his brother and clan. . .Alright, just kill those who knew of it. . And did nothing to prevent it. He went over board. He is SO arrogant at times it's annoying. He charged into the 5-kage summit expecting that the other Kage wouldn't try to stop him?
OR did he think he could over power the 5-kage, their body guards, and all the samuri. His personality. . Ugh. . He went from a somewhat cool, level headed kid to a maniac. . . It's fine to have trauma but. . God, once he got the MS he just went off the deep end.