Even with no more significant free agency moves and just a decent draft, I think the Patriots are in a good position to be top 10 on offense and top 10 on defense. With some luck with health / injuries (on the team and for opponents), the Pats will have a really good shot.
I rather doubt that Pats are going to be consistently overwhelming on either side of the ball, though. They've had a nice off-season, but they're not "loaded."