Ode to Mediocrity

I wonder about mediocrity. Has anyone ever extolled the virtues of the moderately skilled? Sung the praises of middle-of-the-road, 6-of-one, luke-warm, neither this nor that, mediocre? 

Perhaps the mediocre sing, tooting their own little tarnished, second-hand horns, slightly off-key but with brilliant celebration. Half-wits and hacks. Thieves and beggars. Those who can see no higher than the horizon, and then can reach that height.

I suspect those who have aspired to something more, something original or valuable, I suspect the greatest minds, envy the attainable height of success reached only by the mediocre, whose pinnacle of success is located so much nearer to earth.