I went to Mr. B's after a friend invited me to dinner. For the money, I thought it was just OK and that it could have been better.
Mr. B's is part of the Brennan empire. The family has numerous (and famous) restaurants throught the city. My friend RAVED about their jambalaya pasta. To me, it was just plain oily and not that spicy. Others at our table liked their food. If you want true cajun food, you'll want to try elsewhere.
The atmosphere wasn't bad but it reminded me of a fern bar. If you're looking for cajun or funky atmosphere -- this is not the place. There seemed to be a number of business dinners while we were there.
Again, perhaps Mr. B (or I) were having an off night. But then, my friend raved about Cafe Pontalba, which I didn't like either.