Summary of the 2 internationals.
I think we all agree that against Wales and Bale he did an outstanding job. Not only overplayed Bale a lot of times and did awesome tackles but he had the best good pass ratio, most passes and most ground covered.
Against Belgium he was a little raw, mistimed tackles but also some brilliant ball steals. And he commanded the defence as well. And as I watched some of the Belgians were really pissed of about him when he stepped up and started man-marking them from time to time. And despite of Your fear never went closer to Lukaku than 3 meters
Maybe he was mentally tired a bit because of the Wales game.
It's obvious that he needs more time to get used to higher level football, but when You're take the facts that coming from a nonamed league, playing never against big clubs he is capable of doing what he've done against RS,MU, Bale and what he did at WC it's clear that he's not mediocracy.
Weakness (for now): play at attacking third, shooting, headers, sometimes overcombinating things
Strength: remarkable man-marking, tackles at sprints, vision on the field and outstanding work pace - clearly he's everywhere on the field, seems physically never tired
It's just up to him and the coaches, teammates to teach and learn those things which is missing from him and I think by January he'll be ready.
