I didn't really know what to expect going in, and there are certainly some issues there with a couple of species, but overall
@twilighter and I were pleasantly surprised. We ended up staying 6 hours and that's with not seeing all the shows. It's the most expensive zoo in Thailand but also was jammed to the rooftops with people and I read somewhere that there's 5 million annual visitors. That seems an excessive amount, but in certain areas (the Elephant Stadium/Walrus zone for instance), Konstantin and I could barely even walk due to the overwhelming number of visitors. For me, personally, it was nice to see multiple ongoing construction projects and aside from the elephants, dolphins and orangutans, almost the entire zoo is of a high quality. There's even some quirky stuff, like the 'Eggs World' building, and some stunning cafes and giftshops.