Its kinda tough to argue against Pittsburgh as the league's best D right now. Theyre tenacious. They have tremendous playmakers in Polomalu and clearly this young guy Harrison, playing the ideal playmaker position at OLB. They also have a tremendous anchor in the middle in Hampton. If anything, possibly their DEs would be their only 'non-strength', if you want to call it that. But theyre leading the league in the major D categories, despite a couple of iffy showings against lesser teams. But when considering a D, I have to factor in D coordinator/gameplan into any given game. LeBeau has obviously been a great D coordinator for a long time, and runs a brilliant scheme. But in a big game, with a single week to prepare and devise a plan to utilize the available players and shut down a specific O, Id still take Belichick every time. He's the x-factor with NE's D that puts them on equal footing with any of the great defenses in the league. Ive never known them to lead the league in any D category, but they usually rise to the occasion when it matters.