I think a lot of you are missing the boat here. Not many people ever said the movie looked great. What many, including myself, always said was that the movie didn't look bad enough to warrant the huge amount of backlash it received. Yes, it's a remake of classic that a lot of people hold in high esteem and these types of remakes don't have a good batting average at all. So what is it about this Ghostbusters film that caused it to earn so much more scorn then the other countless remakes we have seen?
Take the recent reboot of Robocop. Myself and others had looked down on Robocop before release. It honestly didn't look good and didn't feel right. Unlike Ghostbusters, it wasn't coming from a creative team whose most recent film Spy is 94% fresh on Rotten Tomatoes and made Bridesmaids that earned 90%. Yet Robocop wasn't wasn't the most actively hated upcoming blockbuster since before it even began filming. Although, had they made Robocop a woman, it might have gotten close. The extents to which people are reaching to protect that element are absurd.
Take a moment and look up the Youtube trailers for the remakes of movies like Robocop, Total Recall, Oldboy and Halloween. They all managed to earn more "thumbs up" then down and they were not all completely shit on in Youtube before release like Chostbusters was. The most disliked video in Youtube history? The YouTube comments from the Ghostbusters were full of negativity, vile and yes sexism.
Though, again, some people simply won't find Ghostbusters to their tastes, but those people alone don't account for the absurd levels of backlash Ghostbusters remake has accrued since the moment the words “all-female” surfaced, an entire year before one frame was shot.