He needs to improve his decision making a lot to be a starter. He looks a bit like Adama Traore from a year ago, but without the strength to go with the pace. Makes poor calls in the final third, doesn't look up enough, passing leaves a lot to be desired. But then again, he's young, it's his first season in the PL, and he's been through a lot personally.
I feel confident that he has the attitude to get better over the next couple of seasons, after which he could be a valuable player. But there's time for that, and till then he's a useful squad player who can come on late and trouble defences with his sheer pace. If he's in form, he can get us a goal or an assist from time to time as well.
Also, he's better on the left than on the right.