You clearly haven't been to many zoos then.
I don't know how that is the conclusion you reach but it is inaccurate.
What exhibits (other than the great apes) do you think are horrible?
Nearly every single big cat enclosure I have seen is better than the grottos the Brookfield Zoo has.
Feathers and Scales exists completely contrary to what I believe the modern zoo should represent. The birds are literally behind bars and all of the aviaries aside one are grossly small. The one acceptable aviary, which is admittedly very large, was very awkward to observe. Nearly every single one of the terrariums in the building were too small as well.
I didn't find that the pygmy hippopotamus, tapir, giraffe, wild dog, and pinniped enclosures were too small or anything serious like that, but they were hideous. The enclosures in the Australia House were also generally unattractive, but they weren't terrible otherwise.
While the studies do suggest that the stimulation in the environment dolphins are given is more important than the size of the environment itself, that should not be used as an excuse for the fact that the pools at the Brookfield Zoo are too small, as I've sadly seen many people on Zoochat suggest. I applaud the initiative to update the existing pools so that the dolphins might be more stimulated, don't get me wrong, but it just isn't enough of an improvement.
The rhinoceros, duiker, pangolin, and okapi enclosures were too small. It is sort of surprising that people ignore how small the pangolin enclosure is just because they are the zoo's stars on Zoochat.
Aside from the spaces the gorillas and orangutans are afforded, the biggest problem with Tropic World is that it is understocked. Also, fairly simple modifications could be made so that the ground area in the three rooms would be a suitable home for more terrestrial animals, but that hasn't happened.
I've also seen a lot of people on Zoochat argue that the Brookfield Zoo can be given a pass on all of its glaring problems because they have
plans to correct them. Until the changes are actually made, those problems still exist, and should be addressed here like they exist and not just addressed like they won't exist in the future.
Brookfield has one of the most undoubtedly comprehensive collections of any US zoo.
Having a comprehensive collection is only a small factor in what makes a great zoo.