This is a very nice, mid-sized aquarium. Everything is well cared for, there are plenty of staff/volunteers who are very engaging with visitors, and the combination of insectarium and aquarium is novel. All exhibits are well laid out with no clutter. There are a number of direct and indirect interactions with the inhabitants. All in all a 4.5 star experience. Agree with all plusses noted in previous reviews.
Some other reviewers' criticisms are difficult to parse. The main one is that it's too expensive at $40 per adult. It's not obvious how to gauge value for something so subjective. Someone compared this to Monterrey Bay, the crown jewel of aquariums. That's a $65 ticket. To me the NOLA aquarium is comparable to the National Aquarium (Baltimore Harbor), which is $50 or the grandparent of aquariums, New England (Boston), which is $40. To complain that parking adds to the cost may be true, but it's true at pretty much every urban zoo, aquarium, etc.
Other reviewers felt there was a lack of connection to Louisiana's waters. But there is an entire section of the aquarium devoted to the bayou and gulf coast.
Some believed the aquarium too quick to navigate, e.g., 1 h tops. If one takes time to read each display's information and attempt to locate the habitants (particularly the insects!) it takes a lot longer, more like 2 h.
And last, it was pointed out there are too many gift shops, a la a Disney or Universal theme park. We counted 2 shops, one at the exit of the insectarium and one at the exit of the aquarium. This is likely a legacy of when they were two separate operations? But it makes sense to keep the swag separate regardless.