Mediocrity - What's the Problem

My eldest niece recently made a joke, on Facebook, that she was too mediocre to fill-out one of those "Write 25 interesting things about yourself" forms.  I replied,

"Embrace your mediocrity, Amy. Excellence is simply a spike in the norm. Incompetence is just a dip. Stand in the middle and "get 'er done", Kiddo. The hare is twitchy. The tortoise boring. But the dog out for a walk looks like a happy bit*h. Sure, the leash is some times chafing, and the annoyance on the master's face, as she has to wait for it to take a d*ump, is a bit embarrassing, but screw 'em; 'if they don't want to watch than take the collar off and let me run around,' so thinks it. Or some equivalent, much less defined, in its mediocre -- even for a dog -- little mind. It soon forgets anyway, and goes on with its happy little walk. Maybe it'll even get a treat if it does what The Man tells it to do in a timely enough manner."