I think a lot of people forget that the "Dream Team" Eagles had their former OL Coach at Defensive Coordinator. Andy Reid replaced Sean McDermott with Juan Castillo (looks awfully dumb in hindsight), and Castillo utilized a scheme that did a terrible job of playing to the talent on the roster. Even still, their offense finished #8 in PPG and their defense finished #10 in PPG Allowed, so their 8-8 record actually was quite unlucky (according to the pythagorean expected wins formula, they should have went 10-6).
Plus, the Eagles didn't have the talent that we do if you look at their defense. They had a great DB trio with Nnamdi, Asante, and DRC (who were completely misused by their DC), but outside of that, their defense was quite underwhelming. Babin and Jenkins were very talented pass rushers on the DL who were run defense liabilities. Trent Cole was a very good all around DE. And then they had a lot of nobodies. On the other hand, we have a great trio at CB combined with a great trio on the DL (comprised of two All Pros), a great duo at safety, and a good ILB (Barron). We're much more talented on defense, and Castillo to Wade is obviously not comparable.