There's no reason to flame him if you don't like his voice. I don't think he's harmed the world (unless you consider his singing harmful, but I don't). I like Justin Bieber's singing, but his songs about girls are getting boring.
He's just some litte kid that got found on youtube by some other talentless artists (pop,rap,etc.) and got lucky. And his music is still as suckish. LISTEN TO METAL! YOULL THANK ME WHEN YOURE A BADASS