Cajun food is much overrated. Some good things come outta there, but they take pride on burning and over-spicing with hot peppers what the rest of the world calls inedible and calling it a delicacy.
Cajun food is about as authentic New Orleans as the Philly Cheese Steak. If you want good cajun food (and I doubt you've ever actually had any) go to Lafayette or Whiskey Bay. If you are in New Orleans and want good cajun food, go to Frankie And Johnnies or get a pound of crawfish, some beer, and sit on the levee.
If you have been to NOLA and had Cajun food, you no doubt ate it at some frigging tourist trap where they do burn and over-spice everything.
Like I said, you just don't know the difference.