There are very few foreign players who arrive in the Premier League and hit the ground running, and that's true about players who have arrived on the back of stellar performances in La Liga, the Bundesliga, Ligue or the Eredivisie etc.....in JL's case he's hobbled in here after a very difficult season in Italy where it just didn't work out for him.
In our position he's the type of player we can attract and afford so we simply have to give him time to integrate. I've seen some real positives like his pace and ability to get in behind, and some negatives like his finishing and his final pass....but in truth he's surrounded by players who have exactly the same deficiencies. DCL has missed far easier chances than him this season and will continue to do so. If he contributes some assists, 3-4 goals and occupies defenders to give others space, plus allows us to break out from tight defensive situations with his running then I think thats what we need to value in our current state.