Okay, I took one for the team -- I got a $6 ticket and saw the movie (2D) tonight.
My overall thought is that the disagreement over movie quality consists of (1) the movie is gender-targeted towards women and (2) it encroaches on a beloved nostalgic property that people can't dissociate from and (3) it's not a bad movie, and it's actually a lot of fun in spots, but it's also not a super-great movie... i.e., it's goofy summer fare.
A number of things:
1. The first 10-15 minutes are REALLY flat. Like, I was like, god, if I have to sit through this damn thing... Not horrific, just one of those things where a movie feels like it has no life / everything is inert. I had a few laughs wrung out of me around the 12 minute mark (rough guess), and then ramped up so i was laughing fairly regularly and enjoying much of the movie by 30 minutes into it. But yeah, it really needed some kind of kick in the early minutes. I could see people giving up on the movie after ten minutes without realizing it gets better.
2. If you don't like Paul Feig movies, yeah, you probably won't like this. if you liked The Heat, Spy, Bridesmaids, etc., then there's a decent chance you'll find some enjoyable sequences / banter here.
3. The movie is best viewed as a riff on the Ghostbuster elements, versus viewing as either a sequel or a remake. I highly advise not trying to compare or connect the two movies -- just take this one as its own picture.
4. Kristen Wiig's character is written very very straight. She eventually starts doing some funny Kristen Wiig stuff, but she really is kind of dampened for much of the movie. A lot of the heavy lifting is done by Melissa McCarthy, who is adept enough to handle it, but she shines most when she has someone to play off of... and eventually there are some decent sequences of her and Wiig going around and around.
5. The real star for me was Kate McKinnon -- damn, she made me laugh as the quirky mad-scientist/hack. most of it was her quirky / affected behavior and speech, but hey, I like being surprised, and I never quite knew what she'd do or say next. The Wiig / McCarthy routine is still funny, but pretty recognizable at this stage. Leslie Jones also does perfectly fine and is funny -- it's just that she's playing the "Feisty Black Chick" role. Nothing wrong with that, but yeah -- that's what it is. we've seen it before; we'll see it again. And it's the same kind of role the old movie had ("random black guy"), so... yeah. At least she actually had a lot more life than Ernie Hudson.
6. The original Ghostbusters has better ironic moments and overall a more momentous plot, even if maybe this movie has more consistency and tries to do more with a story. The plot here isn't really the strong suit of the movie, it's kinda "eh" and downgraded a bit, the ending is rather flat too.
7. There are probably 7-10 cameos, some by original actors, some by original characters. A few are decent, a few fall flat. You can either take them at face value and embrace what you can or you can be offended by them -- your choice.
8. There's a few cool ghosts. They weren't necessarily integrated into the story well, but conceptually they were kinda cool. (The opening ghost is one; the ghost balloons were also pretty cool.)
9. A few of the jokes are socially timely and almost like, "Damn, did they just say that in a movie?" About 70% of the audience tonight was black, and they ate it up.
10. Chris Hemsworth seemed to enjoy the hell out of this movie, playing a really cute/hot-as-hell mental vegetable. He just hammed it up... and damn, he can dance too. I think he really enjoyed just being given a chance to relax and act stupid. Since he's played mostly for laughs and as a sex object, I guess guys can determine whether they can laugh at it or not.
11. ... and the dreaded gender divide. yeah. I gotta say, there were a decent amount of men in the theater, but they always came with women, and it was the women who were much more highly represented in the laugh-o-meter for the first half of the movie. Every loud laugh moment was dominated by women laughing at stuff Wiig and McCarthy were doing that women would find funny (women banter and expressions and stuff) but maybe men just wouldn't really pick up on or be interested in. The men did warm up and by the halfway point and later there was a decent amount of male/female laughter in the theater. But definitely I think women seemed to be more enjoying this movie. hey, what can I say? I came in prepared to hate it, but I was laughing through much of it; I'd probably give it a 6.5/10. Paying $6 for this was a deal. If you have to pay more, I'd redbox it.
EDIT: Hmm, just saw Peter Travers' review (rolling stone, I think?) -- "No big whup and no big fat flop either, the female reboot of Ghostbusters settles for being a fine, fun time at the movies." Yup. I agree with that.
There's also a lot of shit in the credits. Small scene snippets here and there... various clips of Chris Hemsworth dancing (and the extras all dancing following his lead)... yeahhhhhh.......and then one at the very very end after all the credits are done.