In general I thought the government response was fairly good. I had helicopters flying over my house in Baton Rouge for several weeks starting very shortly after the levy collapsed.
In the real world nothing works perfectly and there is always room for improvement.
Nagin’s authority ended at the city limits. He couldn’t call the mandatory evacuation until he had somewhere to shelter everyone in the city who needed shelter. The only option he had was to use the Superdome until the dingbat did her job.
Nagin had his faults and issues but the person most responsible for the fiasco was the governor.