It's just a cookie made with ginger. What's so special about that? The only thing gingerbread really has going for it is the fact that it can be used in a million different holiday-themed cookie recipes. "Hey, let's make some holiday cookies! Oh, I'll just use some ginger, and some sugar, and some molasses, and... yawn.
Despite its overhyped status, some people actually enjoy gingerbread cookies. They're just a bunch of people who enjoy pain and suffering, probably.