We’re looking at the highest and lowest graded performers on defense for the Philadelphia Eagles through the first four games

As a reminder, in PFF's grading scale, 60.0 is the baseline for an "average" grade. 70.0-79.9 is considered above average, 80.0-89.9 is good, whereas 90.0 and higher is elite. On the opposite end of the spectrum, 59.9-50.0 is below average, 49.9-40.0 is considered poor, whereas 39.9 and below is very poor.