The two parts I have bolded I disagree with completely. The first is a simple matter of opinion, the scond is just wrong - when Fellaini was first given a chance this season, in the majority of games he played a box-to-box role. In his last couple of games against Liverpool and Southampton he was moved to being a dedicated DM, a decision I (and most others) disagreed with, but even prior to that he was not an AM. He got forwards and into the box when required (as LVG no doubt instructed him to) and obviously if we are chasing a game you will want players who can be a threat to play further forwards, but aside from that in the normal passages of play he played box-to-box - look back on the caf and you will see how many people were surprised to see him being able to play well as a proper CM, not just an AM.
I didn't say he played classic AM who played in front of two midfielders, I agree that he played box to box. Apart from Liverpool and Southampton 2nd half games, he played in 3 man midfield, alongside Rooney or someone else in front of Carrick/Blind, and he was sometimes even more attacking than his midfield partners. Anyway, he wasn't the one picking balls from defenders, it was Carrick or Blind, apart from those two mentioned games when our build up play from the back was awful anyway.