As I have said before, two things can be true at the same time. The Pats are a good team, better than I thought. Better than everyone thought. This is true. It is also true that the Pats have had the easiest schedule in the league so far and no doubt have some number of more wins as a result. How many more wins? I don't know.
It is an odd season. They have losses to the Raiders (were not quite ready) and the Steelers (5 turnovers) but have wins vs. the Bills and the Bucs. They only beat ATL by 1 point. Just because an opponent has a worse record does not guarantee a win. A bad call penalty, a missed catch, a broken tackle, a small thing can change the outcome of a close game.
I don't know who the best teams are this season. It is usually easier to tell. IND has the second easiest schedule (per ESPN). ESPN has KC as the top rated team with the 5th hardest strength of schedule. They have DEN ranked 12th. PHI looks solid to me, but I am not sure who else.