Planet Zoo is a highly ambitious venture. It is very fun but it has its downsides like any other simulation game. Some of the systems prohibit a simple, fun experience, others are minor issues that can be fixed easily. But the fact that they haven’t been fixed yet is infuriating. It is gorgeous when it comes to looks but most of the part, it over-complicates itself with pointless systems. The terrible optimization somewhat adds to the negative feeling and that is what ruins it for me.
Source: N4G PC Planet Zoo Review | Spiel Times