I wouldn't have put Cincinnati*'s hippo exhibit for more than just the obvious reason. But I say this as well because it was the final phase of Africa and after 11 years of planning, and over 5 years of construction, it's finally complete and Africa is now together as a whole. Still, despite this and it having my favorite predator exhibits in a zoo, I still would consider Africa a little weak. There just wasn't enough space to "transfer people out of Africa" like I've felt in Columbus.
The only other one I saw was the much needed Tiger Passage in Cleveland, which definitely surpasses the quality that the zoo brings throughout the rest of the park if we were to compare it with their other exhibits.