I agree - Justin is a joke. Just about every commentary I've read labels him as a "light weight".
He was a drama teacher prior to his father's death and iirc it was only because of the eulogy he delivered at his father's funeral that caused all the liberals to be in awe and give him visions of grandeur and thus a move across the Country to become an MP.
Who knows what will happen in 4 yrs though. He might inspire the younger vote.