I think a lot of the negativity comes from poor expectation management.
It comes from taking the marketing fluff and applying the most extreme definitions to marketing keywords, or even reading too deeply into the them. Take “realistic” for example. How do you define it, how do I define it, and how does über animal fan Karen define it, or how does Karl “I’ve been waiting 15 years for this game!” define it?
To use your own words Masteradstriker, what does “the best zoo game ever” even mean? PZ might be the best zoo game to me, or you, but not Karen or Karl. Why? Self formed expectations. My expectations are probably lower than Karen’s. While I’m happy with what I see, Karen feels betrayed and lied too. That’s what is playing out. The exact same thing happened with PlanCo.
PlanCo was marketed as “Simulation Evolved”, but again what exactly does that mean?
I agree with this but then again it's not their fault. Simple test what games with animals do you have? Zoo Tycoon both for PC and Xbox, Wildlife Park, Afrika for PS3, Cabela hunting game, and that silly Wild expansion for RCT3. They said Planet Zoo will have the best animals so far in the games (which also people should know that some of it is for marketing purposes of course) right? Just Compare Planet Zoo animals to all those in other games and they didn't lied.
The different thing is if "Karl" go out from reallity and start to imagine things.
People like "Karl" could also be rude and ungrateful. Remember when they announced first Aldabra tortoise and then Himalayan brown bear.. there were dozens of threads how Frontier doing the same thing like with Zoo Tycoon (XBox) adding numbers of same subspecies and overcrowding roster with them. I mean WHAT! Seriously. We have amazing roster in the Planet Zoo and it could be just better and out of 50 different great animal species you are bothered with just two alike ones? We have aardwarks, african wild dogs, african buffalos, gharials, orangutans, mandrills, snow leopards, okapis, pronghorns etc. and you are bothered with Himalayan brown bear? It is ridiculous.
But some people obviously have version of Planet Zoo in their minds and if Frontier step off just a bit from their imagination then you will have rant threads and posts.
Of course this has nothing to do with bugs in the game, which again people should be more patiant and reasonable, but they should give feedback and Frontier wants and needs that of course how they be able to make best experience for the game at launch.