Interesting concept.
As a photographer myself, I can appreciate the aesthetic. The photos make a good series, as they have a very consistent feel. Creating individual photos that are dramatic or make a statement is relatively easy (assuming you have photographic talent). Creating a body of work where the images work together as a group (as well as being able to stand on their own) is much more difficult. The fact that they are square implies he is using a medium format camera (I suspect digital as film with its low ISO would have a tough time getting sharp animals in these indoor exhibits).
As a zoo fan, I agree with previous posts. These may very well be the worse part of an exhibit that contains a much more pleasing outdoor section. A good photographer can make a good subject look bad (which may or may not be the case here) and a bad subject look good. However there is no shortage of substandard animal exhibits in the zoo world and many of these may indeed be as bad as they look.