This may sound silly, but you have the choice of whether the objective marker is on or off, what have you done?
I started with it on but I recently turned it off, it was about the time that I had to hunt down some enthusiasm. The way it works is the closer you are to somebody with some to spare it will glow green, but with the objective marker on it shows you exactly where the person is without having to look, which kin d of takes some of the fun out of it. There was also a quest before that involves finding three lost children, but each child was on the map glowing so you knew exactly where they were.
I don't mind having a vague objective marker but when it points out exactly where hidden stuff is it just seems to defeat the point.