Fresh out of there. Initial reaction: It's nowhere near as bad as the trailers. Nowhere near. Some laugh-out-loud moments, some old style dry humor. It loses focus a lot, whenever the villain is around, really. It's not as consistently funny, but it's also legitimately scarier than the original. The actual...not science, but ACT of their job is far more prominent, there's no montage of them learning the ropes.
The big drag-out fight was fun on a technical level and some seriously great shots, just felt out of place. Whenever the movie mocked the haters, it slammed on the brakes and lost all momentum. The ending is a bit more contrived than crossing the streams with an even more prominent Chekov's Gun but it's not worse, personally.
Characters are great, except Patty is an exposition dump with little characterization. That's not Jones' fault at all, that's the script. But whenever she was in Plot Mode, her entire speech pattern and mannerisms changed, when she was ad libbing and doing comedy, she was great. The main cast is pretty awesome, the cameos are pitch perfect but this is one of the LEAST New York movie to ever be set in New York. That's me being a bit of a snob but there are glaring problems with...product placement, subway usage, settings, and stuff. The streets in New York do not look like that, anywhere. That's Boston. Don't fuck with me, Feig.
In total, I liked it more than I ever expected to. It was more Real Ghostbusters than Ghostbusters and I don't think that's a bad thing at all. My reactions sound more negative than I'm feeling, I had a good time.