Since you guys seem to like debating the new Ghostbusters movie and the neccesity of reboots, I guess I'll throw in my two cents. Just a forewarning, I've never seen a Ghostbusters movie or any of Melissa McCarthy's work, so this is more on the topic of reboots and remakes as a whole.
The fact is, hardly any movies actually need a reboot and are usually just to cash in on nostalgia. But that doesn't mean all reboots are bad. I liked Disney's new Cinderella movie even though nobody was asking for it. But Cinderella at least tried to do some new things and update the story for a modern audience. Another example is The Amazing Spider-Man, which while retreading a lot of material from the Sam Raimi movies and adding in an unnecessary subplot about Peter's parents as spies, had one of the best romances I've ever seen in a superhero movie. There will always be bad reboots, but as long as they add new things to the source material and try to do their own thing, I don't think they can be written off so easily.
I get why fans get upset over reboots, the fact is Hollywood will keep making them until people stop going to see them, and the originals still exist and are just as good as you remember. I think that each reboot should be judged on it's own merits and not just how it compares to the original. As for Ghostbusters, I have no idea how it's going to be, but I'll give it a chance.