I have also shared the thought that Brady is a systems QB. He's great at reading the defense at the line of scrimmage and making those quick throws. He's very unlikely to improvise and make the throws that Brees, Rogers, Mahomes, etc can make.
The reasons the Pats may be good this year:
1. Bellichek's coaching, arguably the greatest of all time
2. Their defense keeping them in games (directly related to my #1).