Regarding Brady, he is still a top 10 QB, but I see him falling this season some. Why? His receiving corps has taken a big hit with Welker gone, Hernandez gone, and Gronk injured. The two TE offense was a big part of the team's success the past two seasons. I suspect that this year the running game becomes more important at the expense of passing. Brady will still do well; but I don't see him as a difference maker for your fantasy team.
I am in the minority, but I suspect Amendola will do as well or better than Welker. Hernandez and his 483 receiving yards and 5 TD are gone. And if recent reports are accurate, Gronk may be back in Week 3. And last year the Pats had the second most rushing attempts in the league.
As I have posted in other threads, the Patriots offense has constantly morphed and evolved. Brady started out as a game manager that benefitted from a power running game with a lot of play action. Then they moved to the dink and dunk, with lots of bubble screens, WR screens, and throws to RBs. Then came the shock and awe era with Welker and Moss leading the highest scoring offense in league history.
Everyone said the offense would collapse without Moss . . . and they scored 500+ points in each season since. That brought the 2 TE set. Then last year they added the high octane, hurry up offense. Whether people want to consider it or not, the Pats offense has ALWAYS been changing and swapping out personnel. Brown turned into Welker who in turn has become Amendola. Faulk became Woodhead who now is Vereen.
Branch became Caldwell who became Branch again who became Lloyd who is now Dobson. The only really unique and hard to replace guy was Moss, and as I just mentioned, they've done just fine without him.
The Pats have become a very good offensive system. Brady has been a great QB, but there's no question that the scheme they are running helps Brady. If the OL stays healthy . . . and they rarely have been over the years, Brady is in for as good a season as any year he's had (save 2007). They will call plays that will get peole open and Brady will get them the ball. Unless the new guys can't catch, Brady will be fine.