This got me thinking that perhaps I need to dig through some results and put some numbers on this.
Since Wayne Barnes started his international career in 2006, he has refereed the All Blacks eight times
2007 v France (lost)
2008 v Scotland (won)
2010 v Ireland (won)
2011 v Australia (lost)
2013 v France (won)
2014 v Wales (won)
2014 v South Africa (lost)
2015 v Australia (lost)
That is a 50% win/loss record; 36% below their overall record over that period and the worst record with any referee.
The All Blacks have never won a Tri-Nations or Rugby Championship match that was refereed by Wayne Barnes (0 & 3)
The next is George Clancy, 3 losses from 7 games (57%)
Here are the full stats for all the current referees (not retired and still still on the Elite Referees Panel)
PS: Not implying anything, just putting some facts on the table. People can draw their own conclusions.