For me positives are:
1-Messi as AM, people are criticizing but he was our main creator and the one who caused most of the danger. Messi evolution was always going to be as AM not as 9, he showed that today. It is the right position for him and IMO this was his best game this season.
2-Fati as 9, finally his natural position, kid showed glimpsed of what he is going to be in few years, he lacks some necessary playmaking skills (just being able to play the obvious pass and playing with his back to goal) but those will come in time. Games like will help him to grow.
3-Dest on the right side was a pleasant surprise, finally S.Roberto might not be our best RB. Kudos for trusting him.
4-FDJ was more involved than usual on offense, which is decent.
5-He used Alba perfectly.
6-Trust in youth even in big games.
Negatives:
1-We have no wingers, and he himself set that problem IMO, he didn't request for a single winger. He wanted 4 players, Dest (RB), Garcia (CB) Winjaldum (CM) and Depay (SS). And even worse no speed in attack again.
2-He set Pedri for failure in this game, was too much for the kid playing in his least favorite position
3-Defense set up is awful, especially with Busquets being a snail.
4-Coutinho wasn't put in his best psoition to perform, now that was because Messi took it and IMo it was right, future will show us if Coutinho early hot start will continue or not, I hope it will and I will gladly accept Messi being pushed up in such case, but I am betting against it.
5-Subs, like wtf.