I stopped here for lunch on a weekday with some friends. The menu focuses on Cajun fair -- gumbo, shrimp, etc. -- along with more straight forward fare such as baked chicken. In my opinion, the food was passable, but nothing to write home about. I ordered the shrimp etouffe and found it was mild and boring. Our total bill was not cheap -- about $20 per person for a lunch that included a soft drink and main course.
OK, what can you expect when you're on the plaza -- overpriced tourist traps. Go for coffee if you must visit Cafe Pontalba. The food is not worth the price (in my book).