Apparently, you can measure grit. Flotsam Media gives us G.R.I.T. (General Requirements of Intangible Talents). I think it should just be GRIT, but I suppose these people like the New York Times style.
The alltime grittiest season belongs to Ron Hunt in 1971. The least gritty season came from Barry Bonds in 2004. Craig Biggio is the career leader and Barry Bonds again pulls up the rear.
G.R.I.T. is determined by a complicated formula that breaks down to (Dirt + Determination - Talent) / Opportunity.