Youd have to be an idiot to think Beiber doesn't have talent. He has talent to spare, that goes without question.
His biggest problem is that he went from a nobody to a international superstar essentially overnight, and the fame got to him. His antics off the stage made him completely unbearable, plus he makes music that caters to the vast idiots of YouTube fandom. What's really sad is that as of late you can tell his world is coming apart, he is obviously going through a mental break with his sudden marriage and how he has been acting.
Miley was the same way, extremely talented but remarkably shitty music combined with her being a snot in general. But if you look up her cover of Jolene, the girl shows what she is actually capable of.