I'm confident in saying that I'm more than sure 90% of people haven't watched him play more than 5 games for Dortmund before his move.
He's lacking in match fitness and sharpness, including trying to gain cohesion with his teammates, this doesn't happen overnight. It's also up to Ole to find the best system to get the most out of him until he settles. And it certainly doesn't help when your midfield can't play the ball through the middle of the pitch.
I'm also confident in saying, he's going to he an absolute menace and nightmare to most defences he comes across once he's settled.