He's scored like 2 goals, if your going down that route most central midfielders are more productive than moussa because he rarely makes assists or scores goals. But what he does do is move forward with the ball and get the oppo defence on the back foot.By scoring and assisting more than every other single player who has played in his position this season. I'd say that was pretty productive.
Pass completion means nothing to me. He had a higher pass completion than Eriksen and Dele Alli this evening and passes backwards/sideways no more or less than Winks and Dembele do.