I think he has handled himself well so far in the season. His speed is a big plus but he has been defensively responsible. Only 18 yrs old so hope he bulks up because some players try to use their bodies against him to get past him or create some extra maneuvering space.
Offensively, he hasn't provided as much, but the frontline(barring Lewandowski mostly) has also been useless and ineffective.