I've said this before, he can't control the game. He's just not good enough to be the main man.
And that's his problem. I still remember the early days when he played CAM for BvB, he was absolutely rubbish (even worse than the recent Performance for us ), Klopp forced Mkhitaryan to replace Gotze and becone the main man of BvB and Micki was so shit because of this. Later on, Tuchel came and put Micki out wide, release him from ball rotation duty, his job was making movement to create space, run as fast as possible to put in a cross (his crossing in 15/16 was really good). He didnt have to participate in ball rotation with Reus and Gundogan (because he's shit at this), all he had to do were making runs, receive the ball, do a 1-2 pass and provide through balls or crosses or making runs in to the box and score. It can even said that he never had to pass the ball backward. In other words, his job was finish the attack or put in a magic moment to assists. He was never good at dictating the game for Dortmund. In fact, he was shit at it.
He's not a 10. He's a RM, that's simple. Even his best performance for us (vs Spurs) came from the right flank.