Positives:
Depth at RB: Most teams with good running attacks have two RB's (Denver, Pitt, Carolina). BB saw this coming and did something about it. Drafting Maroney and at the same time blocking Indy from getting him was genius.
Depth at TE: Another league-wide trend is having multiple TE's sets. Graham, Watson and Thomas offer different skill sets.
Dean Pees at Defensive Coordinator: Even though he is now a head coach, I always felt Mangini was never a leader on defense. Yes, he called the plays, taught the schemes, but not a leader. Pees offers a more fiery approach, something that the younger players need.
Another year of experience for Josh McDaniels: I know Belichick loves to promote from within, but it must of been a huge transition to be a 27 year old coordinator last year. Unlike Mangini, I think McDaniels has what it takes as a coach and his play calling will be better.