The reaction to Ghostbusters was unfair though considering how many other beloved franchises have had apparently terrible reboots (e.g. Michael Bay's Transformers, Scooby-Doo, RoboCop etc.), but didn't receive the same massive level of hate, especially even before the movie was actually released.
Also, the resemblance to a SNL script might be because all the actresses that star in the movie used to be on SNL.