I am Welsh so am impartial !
It is important to separate the roles of the players (and their coaches) and the Team of 3 Match Officials.
At this elite level the coaches determine the overall strategy and major tactical choices, and select their team to deliver it. Then the players have to make their own with how the match unfolds With the benefit of hindsight I believe the NZ players did not play the right game and became obsessed towards the end with emulating the boring, muscular 'pick & drive' we see so much in the NH. They lost because they couldn't adapt, and Ritchie McCaw didn't step up as skipper to take control (he is though one the finest open sides to ever play the Game). Not pushed by anyone until this match, the ABs were over-confident and did not appear ready for an old fashioned match full of passion and physicality from the French. Key impact replacements (Chabal and Michelak) delivered and the AB left it too late with a solitary long drop kick effort, having wasted a number of easier chances.
Wayne Barnes had a pretty good match for someone so inexperienced at this level, made his decisions clearly and with consistency, and communicated well. None of us can imagine the pressure he would have been under, which increased to massive levels in the last 20 minutes.
His critical decisions in my view :
a) French try - possible forward pass. Super fast French break, WB behind by 10-15 m (Spreaders would have 20m + behind !), and at ground level and at that speed very tough to spot it (easy to see on TV with a wide angle). TJ also back on an angle and looking in, so again very tough one to call.
b) YC - deliberate step block, shoulder down and very professionally done by McAlister in the red zone, but Jauzion 'over-theatrical'. WB was playing a penalty advantage already and it was red zone after all. YC
c) he played a scrum advantage, and he called it clearly, and a 50m drop effort is good enough in my book to have gained some advantage.
Overall WB had control, was very clear and consistent, and showed good preventative management. Both AB lost the match and France won it. Wayne Barnes and TJs gave them an equitable match imho.