Barnes is getting a lot of stick, but he wasn't at fault for the farcical situation at the end of the game. The problem is the scrummaging. All i know is that in the modern game it is a very dark art, it's less about winning the ball and more about forcing a penalty. refs have only one set of eyes and they know they get it wrong a lot of the time, so awarding a penalty try for a scrum infringement isn't in the spirit of the game, especially in the final play.
Whatever the whys and wherefores, rugby is supposed to be a game for the crowd to enjoy. 20 minutes of endless scrums is not fun to watch. It wasn't just France Wales last weekend. I watched a very dull ten minutes of scrums at the end of the first half of the Blues against the Scarlets, it's just frustrating to watch.
My solution, I don't get why everyone isn't screaming this, the law states that the ball should be put in straight. Part of the problem with scrums is this law being ignored. This forces a contest for the ball, the hookers are then trying to win the ball, (that's why they are called hookers!) and not trying to win a penalty. When i was at school, I was told that the scrum is a quick contest for the ball with an advantage for the attacking side, just like the line outs, and not a contest for forcing a penalty.
It wasn't a great game, but you can't expect tidy scrums at the end of the game when everyone is tired and non-specialists are taking part in the scrum. Barnes was put under a lot of pressure by both sides gaming the situation and at the end of that day it wasn't his fault in my view that things became so silly.