AWB is not half as bad with the ball than some of you make out to be. I remember people in here saying similar things about Walker and now he's sort of a reference of a bombing full-back.
Walker is not highly skilled but he uses strength and pace to be a force in attack.
Think about Robertson too, he's not as skilled as Arnold but is almost as dangerous, because he knows what he's doing.
Proper coaching will make AWB good in attack. He'll never be Evra, but if he adds attacking threat to his game he'll be outstanding.