I feel like some zoo maps have had serious "downgrades" from previous ones. Here are some examples.
San Antonio - before - Sure the clipart is kind of cheesy, but the map has a good color tone and it is easy to locate the animals.
San Antonio - Now - Overly colorful with very bad color scheme and proportions. What's up with the three elephants when there are one of every other animal?
National Zoo - before - Nice color tone, easy to understand icons, nicely designed icons, not to cartoonish.
National Zoo - now - We've got neutral navy blue clashing against bright green, purple and orange (Which clashes against itself may I add). The icons are extremely hard to understand (They had to put a key in the back), the animals just represent the attraction, not the animals in the attraction, and the buildings are blocky.
Fort Worth - before - Number one - The 3D buildings are off yes, but animal icons here are just well done. They look realistic but are surpassingly simplistic, I feel like the icons would work great on this map

It has a great color tone and is very realistic, but the silhouettes ruin it.
Fort Worth - now - blocky, boring, silhouettes that are confusing (The Indian rhino could easily be a hippo.) and no way of really knowing where you are with those flat buildings!
Indianapolis - before - yes, silhouettes a bit weird, but the map has a good color scheme (different colors for each zone that don't clash with each other), and is simple, yet had key landmarks like the dome and the dolphin building to help you when you're lost.

Indianapolis - now - clashing color scheme, flat buildings, blocky enclosures, and of course the silhouettes.
I might do a zoo map upgrade later, but for now I'm done. I don't mean to be harsh to the designers, they're probably better then me, but as a zoo map nerd, I just am not a big fan.