That's your opinion. IMO His movement off the ball is one of his strengths.
Personally I'd put it down as his single biggest weakness. As a forward anyway. I've yet to see how he does in midfield or attacking midfield where he's supposed to have done well in Germany. But as a striker, his movement looked confused and he just runs around without much purpose.
He's had moments where his technique has looked pretty good, which is the most important thing I suppose. But I've yet to see much else in his game other than reasonable pace and fitness.