The writing is a little snooty and pretentious, but I think the outsider’s perspective makes the article (login) worth a read. I have yet to visit the Aquarium, so anything I say is conjecture. From what I’ve heard, my concerns about it are the same as the author’s were here:

The lack of information and the inconsistency of imagination are strange, given the ambitions and accomplishments of this institution — including an educational program that draws schoolchildren with an apparently detailed curriculum. It is as if once the big effects were created, the creators relaxed into routine. Why though, is there a reluctance — here as in so many other museums — to provide real information for those who want it? Or to design exhibits that don’t just create atmosphere but spur understanding? The now requisite messages about conservation are pumped into a 3-D cartoon, but even they have no real import.

As I’ve come to understand from other people’s accounts, the focus on spectacle rather than on education, for better or for worse, is what seperates the Georgia Aquarium from Chattanooga and most other aquariums.