Been a couple of hours, so i might miss a few of the initial reactions.
1. The movement today was something else than what we have seen for a long, long time. Would be interesting to see statistics to see if this means we ran more as a unit today, or if it means we simply ran differently. It makes a world of difference to mentality, cause running for attack is much easier mentally than running for defense.
2. Love to see Lindelöf gaining some confidence. His star is not burned out yet. If he continues to improve, i would actually not be surprised if he was the one we´re buying a companion too when january/summer comes. Smalling, imo, is more or less playing to his max ability these days, and that is not enough, sorry to say.
3. Martial. He has always had it in him to provide moments of brilliance, and even several of them in a single match. What is relatively new is his acquired ability to track back and do defensive work. This is what makes him go first on the team sheet. Love it!
4. Rash/Lukaku: As others have said, its not that Rashford does a perfect, or even great game. Its that his movement makes everyone else look good. Lukaku, even though he plays only 20 minutes, fail at more or less everything he attempts. I´m not gonna suggest a way out of this for him, he has to find it himself, but he is headed down a blind alley atm. Lets do Rashford or Sanchez up top until Lukaku can find some confidence through subs. I´m not giving up on him by any means, i think he can become quite good for us tbh, if he can put together the pieces of the puzzle. Right now he looks like a nothing player though.
5. Shaw: Does seem to react well to the spell of starts. He looks 90% great, but does have his lapses of concentration defensively. I´m sure Mourinho sees this clearer than i do, but this has to be something they work on. Even if it cost us nothing today, there was plenty of chances to take advantage of Shaw/Martial defensive situation.
improvement
6. Mata: He was not as good today, imo, as he has been for the last few games. But i think we need to admit the recent , Juventus game aside, in style and effort, coincides with the reintroduction of Mata to the team. Probably makes it easier for Mourinho to keep playing him since Lukaku has a dry spell.
Probably more i´d like to say, but this post is too long already.