Just got back from seeing it. I laughed a few times, it's very exuberant, and the effects are amazing. It's not great though - most particularly, it's just not funny enough. The original film wasn't exactly a hysterical laugh riot, but made up for it with creativity and atmosphere. Not a whole lot of that with this film, which is effective a straight re-tread. To get away with that, it needed to crank up the comedy, and there wasn't enough.
First thing I thought back when they did the reveal for new Ghostbusters wasn't "how dare they remake a classic" or "it's feminism gone maaaaad", it was misgivings about the talent involved. Paul Feig's writing is patchy at best, and Kristen Wiig seemed to be the only member of the cast with particular comedy chops. That's turned out to be a fully realised misgiving, as the script is by far the weakest element, and it feels like there was very little improv room even for Kristen, let alone the rest.
There's a post from me somewhere way back in this thread, and one I'd still repeat after seeing the film, that I really wish they'd involved some accomplished stand-ups on the script and cast. Sarah Silverman, Amy Schumer, Wanda Sykes, Kristen Schaal, Katherine Ryan, Chelsea Peretti, Tina Fey... their involvement isn't necessarily a seal of quality (no comedian has a 100% track record in cinema as far as I know), but at least guarantees a few extra gags thrown in during filming, or into the script if they're allowed treatment. There's nobody like that involved in the film as far as I know (aside from Kristen Wiig who has no script credit), and it really hurt the film. Teetering on whether it merits a 3/5.