The Pats were fortunate to have nearly every offseason move click or be an absolute homerun. There was really no way to expect all this unless you are an eternal optimist or a homer.
Most of their free agents have met or even far exceeded expectations. Few people thought Milton Williams would live up to his contract (even people who loved the move), but he has. Diggs is playing like he was never injured. Guys like Tonga and Chaisson seemed like nothing moves, but have been solid starters. People thought the LB corp was going to be a disaster, but Spillane, Elliss, Chaisson, and Gibbens have all played really well. Morgan Moses has stayed healthy. Bradbury has played better than expected. This free agent class reminds me of 2001 or 2003.
Almost every draft pick hit this year. The only draft pick draft in the first six rounds that hasn't at least been a contributor is Swinson. There are three starters from this draft class (Campbell, Wilson, and Woodson) and all are playing really well. Henderson is coming on. Williams is scoring a TD or two. Farmer is an underrated draft pick.
Also, Maye has developed far faster any could have expected. He is playing like a veteran with five or more years of experience. He has already exceeded most people's ceiling of what he could be.
And add several players who were here that no one thought much of are playing really well most notably Boutte. But Lowe was solid since replacing Campbell and no one saw that coming.
It is normally a 2-3 year development process to rebuild a team. The Pats did far faster with an abnormally great offseason and a QB who is having an MVP caliber year when people didn't think he would have anyone to throw to going into the season. This isn't something people should have expected before the season because it rarely happens.