I think people are being overly harsh on him here. That first half was utterly shambolic from pretty much everyone. The CBs were all over the place, Young was trying to play RW (cause playing with Mata is like playing with 10) and getting caught out of possession, DDG making terrible mistakes in his distribution, Fred was also having a mare in midfield, Lukaku was having abysmal touches everywhere on the pitch...
Asking for him to stand out from the rest when he was the youngest player in the starting XI, starting only his second game for us in a new position for him... that is expecting too much right now. Also, the guy is not DM. He’s being played as a regista, a deep lying playmaker. He didn’t really make any mistakes and got subbed because we had to change to 4-2-3-1 to chase the game.
Anyhow, he also didn’t play well and yes people were going overboard if they thought he would immediately displace Matic. I’m a fan of his, but if you can't see he’s still a bit raw and he’s got ways to go and lessons to learn (like today’s) yet, you’re being naive. I still think he’ll grow into that position Mourinho picked for him and seems a good fit. One bad game doesn’t change that.