Naruto was the container of the Nine Tail's which attacked the village he lived in many years ago before the series began. His father died protecting the village and his final request was that Naruto should not be harmed and looked at as a hero. Naruto grew up as an attention whore. He caused trouble and mischief so people would notice him as everyone just gave him the cold should, ignored him and stared at him with cold eyes.
He wanted to become hokage not for some noble cause like trying to better/protect his village but because he wanted everyone to acknowledge him and shower him with attention. Now the character wins battle not by his own merit but by using the nine tail (Powerful demon fox) power out of him when he is getting his ass kicked. Basically it's like if you were fighting someone who could turn into superman whenever they wanted. So essentially he doesn't win battles on his own skill but by just being so OP the other guy can't win.
Now the character not only sees the world in childish ideology of black and white but he forces whatever belief he has down people throats. Sasuke left the village, and naruto wanted to drag him back to the village to be his friend against his will. Obito was a ninja much like Naruto who wanted to be Hokage but things turned bad for him in life. Rather than listening to his view on the world, Naruto just called him stupid and decided to berate him on why he was right.
He's also extremely arrogant and tend to think he's the best almost rubbing it in people's faces over and over on how he's going to beat them. In addition, when the series finally ended and he became hokage he is shown to be a slacker, not knowing what the hell he is doing and only pretends to get work done when people enter into his office.
Contrast this to another character in the series Rock Lee who was told he would not amount to anything and was born with a birth defect. Lee proved everyone wrong by working hard and became a great, humble ninja.
Most Helpful Guy
Naruto is a terrible character. His voice is annoying. He's an attention whore, hypocrite who likes force people to believe in his ideology and overall is an immature kid throughout the entire manga.