I should say that at the Medan Zoo only the primate cages were this bad, most of the other cages ranged from alright to relatively good.
The worst Asian zoos I've been to (and I haven't been to anywhere near as many as, say, Peter Dickinson) are the Bukittinggi Zoo in Sumatra, Jong's Crocodile Farm and Mini Zoo in Sarawak, and the Angkor Zoo in Cambodia. Reviews and photos of all of these are on this forum.
The worst in Australia I've seen was the disgraceful Alma Park Zoo in Brisbane. In New Zealand the Landon Creek Bird Sanctuary down by Dunedin, which got closed down fortunately, and the filthy EcoWorld Aquarium in Picton.