Most of their defenders were older, and while they may not have been all pros in title, they were considered top-caliber defenders. Do you even realize how hard it is to be an all pro? Most of your HOF-worthy players get one or two all pro selections. You don't just get all pro because you're good at burning the clock off so it looks like you're a good defender. And Jerod Mayo was considered by the end of his first season to be a very good player, so I don't see the connection at all. The Pats defense isn't even close to the level it was in 2001-2004.
The man turns most of his defensive draft picks into gold. In addition, the guy built a dynasty that was by no means overpowering. It was built on defense and and ball control. Yes it's overrated, but you make it seem like I'm trying to call the guy a magician. Belichick could make pretty much any team with an accurate passer, a good receiver and a steady runner look better than it is.
Again, if you think the ends justify the means, sure. But the NE defense is 5th in total defense this season, and haven't matched their season scoring average for 3 weeks in a row, while Tom Brady has passed sub-60%, and the defense continues to give away yards, especially through the air.