Sorry you feel that way but its his first season in the premiership. I feel he will improve with time and while his form hasn't been great lately, lets not forget he was our best player at the beginning of the season. To the point where we were relying upon him to win us the points at one stage, due to various injuries in our side.Not every young player becomes good. There is no quality at all there, this is a Bebe-like signing.
If he wasn't fast, he would not have been a footballer. Of course, pace is important, and that will give him a decent career and tons of money, but he will be out of EPL very soon.
OGS and the staff will help him to improve. He is a valuable squad player to have. Not everyone needs to turn out into a messi or Ronaldo. We also need players that can come in and do a job.