It's weird since I'm pretty sure it was always intended to do a "universe" where they'd have (something like) this sequel, along with GB16 and another alternate universe and then combine them or something. But some of the more extreme types are hating this movie for not being a sequel to the (widely hated for many reasons) GB16, even though I think GB16 probably reduced the chances of this (or any new GB for a generation) getting made...
I imagine it has to, since Stranger Things drew on Ghostbusters and many other sources.Someone mentioned that it had a Stranger Things vibe to it, although that may just be a poke at the actor in it.