Two big reasons:
There are some positives, though. I like that you can see the big cats indoors. There aren't a lot of zoos in the US that let you do that. As I've said, I do like the otter, elephant, and hippo habitats, and I'm a sucker for nocturnal houses.
- A lot of the exhibits are either outdated or ugly. The bear grottos might be the worst habitats in any "big name" American zoo, Primates of the World looks like a sterile laboratory (which isn't a good thing for a primate habitat to remind you of), and the outdoor Bonobo habitat is more of a habitrail. I do like the otter habitat, though, and I will defend the elephant and hippo habitats. I've never been in the aviary either because I forgot it (2021) or it closed right when I got there (2022 bird flu).
- The layout is awful. There's so much empty space between habitats, particularly between Small Mammals and North America. Meanwhile, every "ABC" mammal that isn't a primate or bear is crammed into a vaguely shoeprint-shaped area that is painful to navigate (at least for me). The map is also supremely dull, which doesn't help.
I guess Milwaukee was the first new zoo I visited with a "Zoochatter" mindset, which is why I'm so down on it. I don't hate it, it's just the first zoo I didn't feel amazed by.
Those are extremely valid points. There is no doubt that Milwaukee is an old zoo. I'm a sucker for old zoos, so I find Milwaukee appealing. From what I have gathered online, funding is a big issue for Milwaukee, and it has been the reason why some of the newer exhibits aren't as grand as they were originally imagined to be.
I don't remember when the exact plans for constructing the new rhino exhibit were, but I'd imagine it'll be relatively soon, so that will finish up all of the new Africa-themed exhibits. It also looks like they may be constructing new outdoor bonobo exhibits, which would be amazing, so let's cross our fingers that they plan on doing that soon!
There used to be talk about an Alaska-themed area where the current North American exhibits are, so I wouldn't mind if they did that after they finished the bonobo and Africa exhibits.
I don't know if Milwaukee would impeach their forested areas much, as it seems to be something they are proud of, but I totally get why you are frustrated with it.
I am also a fan of the new River Otter exhibit, and I think it is a great example of what Milwaukee is evolving into. I also think that the elephant and hippo expansions, while not being as grand as they were originally planned to be, are a big step up from their former exhibits.
The Aviary building is quite nice. I don't know a ton about bird husbandry, but Milwaukee participates in a ton of bird SSPs, and they seem to be quite successful in their bird department.