+1 Rule of a lot of things, really. Too much of anything drowns you out into the backdrop where it becomes increasingly difficult to stand out.
This is why you need to be careful what you complain about. Be quiet and positive and people will sit up and pay attention when you speak loudly or are critical. If you're loud and negative all the time, people will tune you out and you'll never be heard, no matter how hard you stamp your feet.