We are crying out for someone to do what he does on a regular basis. Unfortunately Carrick is 34/35 and won't be playing every week, plus there will be games where he struggles due to his age.
But to have someone sitting in the middle of the pitch, dictating play, intelligent positioning, forward and incisive passing is exactly what we needed. Defensively he helps massively too, always in the right position to make interceptions and covering midfield runs. If we had a younger Carrick in a 3 with Pogba and Herrera, that would be a very well balanced midfield.