He's by far our best option at CM/DM currently, even at his age. He looked very good when he came on tonight and has looked good all season barring one sub-par half I recall him having.
None of our midfielders appear to be comfortable in possession under pressure, other than him, and despite him being classed as a defensive midfielder, he appears far more competent at driving the team forward than any of our other midfielders. He's not bad defensively either! If we want to play Pogba in midfield, Matic is just about the only player intelligent enough to cover him and dictate the game allowing Pogba the freedom he needs. Pogba with anyone else at CM doesn't work, as we've seen demonstrated repeatedly.
He should be playing as many games as possible for us, even if it's just for 60/70 minutes if that's all he can manage.