His contribution so far this season has been decent. His stats are looking good (6 goals, 9 assists from 22 games), but he needs to do it on a more consistent basis. He basically contributed his four league goals and eight assists in five games, while four goals and four assists came in two games (Arsenal home, Spurs away).
There are clearly signs he's still settling in though and he had an injury which disrupted his season as well. Over the last few games since coming back from injury there has been gradual improvement in every aspect of his game, and he scored against Ajax away, created the winner at Carrow Road, scored for England and won us the game at White Hart Lane yesterday. If he can build on that we should be fine in the run-in, with Nani still finding his form and Valencia being back as early as next week.
Overall I think we can be quite pleased with our wingers scoring tally this season:
Nani: 8 goals, 13 assists
Valencia: 4 goals, 12 assists
Young: 6 goals, 9 assists
Can't really ask for much more tbh.