The overwhelming tone of pieces about Comcast’s Xfinity Mobile service have been flat to negative during the past week. Most reporters simply reported the launch deadpan, with neither enthusiasm or critique. But if you look at what happened in France, it could give at least a hint of the market devastation which may come to pass in the US. Coverage of both analysts and journalists this week seem to feel that the existing MNOs, such as AT&T and Verizon, have a great brand, which people love, and that Comcast has a culture of poor customer service. Those writers betrayed how they think about Comcast, as a supplier. But the truth is that Comcast has low broadband and TV churn, despite…