Saw it. It's good. The pre-release hate was definitely unjustified.
If you're on the fence, I'd say go for it. There's enough genuinely funny material to make it worthwhile. As far as the "all woman" thing, if you hadn't seen the original, you probably wouldn't have thought anything of it. These are four funny characters who all happen to be female. It would've worked just as well if they were all guys.
Mild spoiler dressing
[spoiler]It is a reboot. It's not a 30 year later spin-off. However, these are all new characters. They didn't just cast the original characters as women.
All the major surviving cast from the original (sans Rick Moranis) do make cameos, and they're all hilarious. Again they're all different characters, although they do faintly imply Aykroyd may be Ray. Even Annie Potts has a cameo.
And there is a post-credits stinger[/spoiler]