"Barrett missed a few sitters, and that's at his Hurricanes home ground where he should be able to kick with his eyes closed."
Cilliers went as far as to call the All Blacks "arrogant" for their preference to kick to the corner from penalties because "they think by going for corner all the time, they'll get a try."
He compared Barrett to the likes of England's Owen Farrell and South African Handre Pollard, who have both done damage from the tee against the All Blacks in recent years.
"For a World Cup you have to train those things; that event is a different kettle of fish in playing style. There is a better chance of some close games, especially as the tournament wears on. If they don't sort out Barrett, I'm telling you they could run into problems.
"He is an unbelievable rugby player, I rate him, but place-kicking wise, he is not in the same league as Farrell, Jonny Wilkinson, Morne Steyn, Johnny Sexton or Leigh Halfpenny."