"My beef isn't with Barnes so much as with his inexperience. This was Barnes' biggest game by far. On the big stage, an inexperienced referee is likely to become so afraid of making a mistake that he stops making any decisions at all.
"By the end of it, I thought Barnes was frozen with fear and wouldn't make any big calls."
Among his decisions, Barnes missed a host of apparent ruck indiscretions by the French and a forward pass that led directly to a French try.
France lost to England in the semis. South Africa won the tournament.
McCaw's comments follow claims in former All Black coach Sir Graham Henry's book that the team were victims of match-fixing.
McCaw, 31, also talks about what went through his head four years later when the whistle blew to end the 2011 RWC final - meaning the All Blacks had won for the first time since 1987.
After beating France 8-7, the next few moments went by in a blur, he said.
"The moment I've been waiting four years for. I thought I'd feel more. It's like I'm seeing it all through someone else's eyes. The welling emotion of the crowd rolling over me, too mentally and physically shot to really respond."