It's a shonen thing about ninjas in the likes of Dragonball Z / every other manga about boys that fight and steadily increase in ability. It's about an obnoxious yet lovable (arguably I guess) boy infused with a demon at a birth that dreams of becoming the big top ninja in his village so he can be respected by his peers.

I personally like it :3 And people hate me because I like it. But that's alright, I don't mind being hated. Narutards all the way.

I suppose people hate it because it has no pirates