Week 1 of the 2014 season is in the bag. it's still early, and there will be a lot more regressing to the mean happening in the next few weeks as teams' statistical performance begin to more accurately reflect their true capabilities.
Last year I calculated the offensive and defensive DPE ratings using a normalized scale. This year I'm using the actual average points per drive. It doesn't change the ratings in any noticeable way, and it makes the measure a bit easier to visualize.
I'm having some difficulty embedding the visualization, so until I can sort that out, you can play with the interactive version here.