I visited the Denver Zoo in Summer 2022 and I thought it was great. Predator Ridge, Elephant Passage, Tropical Discovery, Primate Panorama, and the hoofstock collection were all highlights. In my opinion the zoo's real problems come with the direction they began to head in after Elephant Passage was built. The Edge (new tiger exhibit) is awkward and unnaturalistic in comparison to the wolf habitat it replaced, and Harmony Hill (North America complex) is forgettable with a weird name and theming. This very month they've opened a new Flamingo exhibit, but nobody has cared enough to discuss it at all and unfortunately the exhibit isn't netted over for the birds to fly. Construction is also underway for a new Australia Complex, and it is supposed to have a couple nice species (Kea, Cassowary) but it is also disappointing to see Denver replace their entire bird house with what will primarily be a wallaby walkthrough.
Denver is a great zoo with a nice hoofstock collection and 4 top-notch exhibit complexes, but it is also disappointing that their newest additions aren't as innovative or unique as what they've built in the recent past.