I marvel at how many players - including some that many of us consider to have been good fielders when they played - have a D level range. Granted the stats used to determine the rating are objective, but the assigning of grades for a certain level of performance has a human element to it. I know since giving letter grades for performance is what I get paid to do.
So if a certain number of assists is required to get a C or higher, and the result is that the majority of major league players are at D range, it means you need to lower the standard a little. If the majority of students in m classes got Ds the Dean would eventually notice. Obviously the solution is not to lower standards substantially, but someone must have had a C range if that is the medium level.
I always laugh when I see a major league baseball player that has an A defense rating and a D range - essentially that means that he you can't hit the ball past him - so long as you hit it right to him. Or those with D defense and A range - can get to any ball hit, but then can't field it.
A few more Bs and Cs, even at the risk of "grade inflation" would be good, since a lot players here agonize over defense only to find their teams massacred by the Vern Stephens, Bip Roberts and Howard Johnsons of the world.