have not visited, so I have to be careful
of course
I have (also behind the scenes), and I can confirm your points of critique, including parts of the World of Darkness. And what is it with you and the term "of course"?


In general, there seems to be a cultural difference in judging the size and aptness of an exhibit when it comes to Americans and some Europeans. Some of the American zoo exhibits, in particular in regard to reptiles, would be totally unacceptable and even illegal in several European countries. Hence, it does not surprise me that the zoos listed as counterexamples by lintworm are all from (Northern / Western) Europe.
I doubt that there is something like a truly perfect zoo, as zoos are in constant flux due the changing influences of cultural zeitgeist, knowledge, technology etc. and the complexity and diversity of what makes a zoo "perfect" (which might not often be apparent, like how the zoo treats its staff, how "green" it is etc.) Furthermore, there's always the individual bias: a fan of venomous and poisonous critters like yours, truly,

might appreciate a well-run petting zoo, but I would probably never rank it as perfect, as it showcases none of the species I'm most interested in. On the other hand, an elephant fan would consider my little WdG as imperfect, since I don't and will never keep elephants.

At the moment, and IMHO, there are zoos and aquaria like Arnheim, Vienna, Shedd etc. that are scoring highly in many fields. But I doubt that any of them ever was, ever is and ever will be perfect.