What I like the most in Adrian is his low Profile and humility even his $$$$-contract achived. If you look around the league (now and then) and see those super stars (A-Rods, Mannys, B. Bounds, etc .), most of them recieve a lot of flash, merchandising, go out with celebrities, make funny shows, use drugs, etc. And my man A-Gon will make and keep similar numbers (at least .300/30/100) in the game without that spotlights and bad behaviors.
What the RS gained is a whole-package Baseball player; he can make the numbers, a better locker room, guide the young players, support his teamates in a slump/personal situation, take and assume responsabilities, etc. He used to it in SD. All these are unvaluable things, and the Red Sox already paid.
Of course, it'll be fenomenal if he break some records out there (and surely he will) l don't know if HRs, but the most important thing is the Human being he is and what directly (.300/30/100) and indirectly can bring to this team.