There was a lot to be optimistic about in the way that we played, and I think this match perfectly illustrated the issues we are having.
Firstly, it is evident that some players just aren't good enough on the ball and aren't good enough in their decision-making. Dalot, Wan Bissaka, Scott McT made crucial errors in build up and make mistakes in their off-the-ball movements. That frequently left us exposed and broke our build up. They aren't bad players at all, just can't seem to play the style.
Our second, and arguably biggest flaw, is that we lack a physical presence up top. We aren't winning aerial battles, we get pushed off the ball a lot and we don't seem to handle body contact well. We need someone up top that can physically match premier league defenders to give them something to worry about.
Finally, we have two players who are very good technically, but that either make the wrong decision or lose their concentration at the wrong time - Bruno and Rashford. There's a tendency from both of them to play more individually, and that is sometimes detrimental (other times not, because they are quite good footballers). I don't expect that to be much of a problem if we sort out the other stuff though.
On to the good, of which there was plenty.
Sancho did a very good job opening play with his movement - if he gets his dribbling ability back at some point, he could be very good for us. He's too physically weak to be our main man up top though.
Antony can apparently dribble, cut right and cross well with both feet. His second half was quite good.
Eriksen is a gem of a player. His movements are excellent, his passing is crisp and he works hard. Love the guy.
Martinez is a very good player, it will be interesting to see how he develops into his role, as I can see him sticking around for many years.
Tactically we looked very decent. The errors that crept into our game were mostly down to luck, relative physical weakness, and mistakes made by players. We could have won this comfortably if the quality off and on the ball was a little better from a handful of players, and I think that's key to remember. We aren't quite there yet in terms of players, but there's a very good side being built here.