From what I've played of it (up to the library) it is the single best game I have played in a long time. I GOT TO FIGHT THE FUCKING STAY-PUFT MARSHMALLOW MAN! That is like a dream come true.
The flaws are GREATLY outweighed by the detail, story and overall fun gameplay of ghost wrangling. 10/10 from me.
One gripe follows, though (very minor spoiler, about one of the details in the fire station).
The Vigo painting still exists and talks to you (suggesting it's the original). At the end of Ghostbusters 2 the painting was destroyed to reveal the other painting of the Ghostbusters and Oscar under it.
I'm such a nerd...