Yep a disaster in some peoples eyes....... but few deaths, people not stranded in rising water, very little looting, etc. A little more complicated than moving some 1/2 million or so when you are trying to move some 3 or more million..
Now all that said I doubt any evacuation plan for a major populated area will get the people out in a short time. I think that is evident with the two sister hurricane evacuations.
The New Orleans MSA has 1.3 million people.