I'm impressed by what I saw from Rangnick's first United side today.
He's had two training sessions with the players, one of which was a recovery day for everyone who played against Arsenal. However, in that time, he's managed to get the players clued into his 4-2-2-2 and able to execute his pressing tactics. For 45 minutes we were completely in control.
Clearly, second half, we witnessed that our players bodies are a bit behind their minds in following the gameplan. Rangnick mentioned that might happen pre-game, when he was talking about how it wouldn't be possible to turn the players into pressing monsters overnight. Still, plenty on display to be optimistic about for the months ahead if the players fitness levels and decision making improves. If we're able to capitalise on the moments when we've got the opposition boxed in it'll make getting wins much less difficult/energy sapping.