If he's going to use his substitutions like he did today, better not to use them at all. Especially Mata for McTominay turned us into a one-man midfield and subsequently gave CP breathing space to exploit in the midfield and precious seconds on the ball. In the end, it gave them all three points too. Greenwood for Lingard made more sense but then again, our main issue was the inability to be creative in between the lines and not the absence of forwards. We possess little quality in terms of creativity in the final third and it's going to hurt us a lot throughout the season but trying to basically bypass the problem by throwing forwards in the box isn't going to bear much fruit. Either Pereira (the only option) or Mata (in this role) would have been preferable IMHO.
I don't agree with the rest of the unfair criticism after these three weeks as i believe that the two missed penalties have cost us precious points and they have made things look worse than they actually are. Despite CP constantly time-wasting and parking the bus, we found the way in the second half to raise the tempo and force our rhythm to the game. This was a desideratum under the previous regimes, not a given.
We are indeed heavily dependent on Pogba to get us going. It's also true that we should not have gone into the season with Lingard, Mata and Pereira as our main orchestrators in the final third. It's also true that we're going to struggle the moment we'll face a major injury crisis. But i feel that this tells more about the club's organization and ambition than it does for the manager's choices.
Long story short, losing all three points can be blamed on Solskjaer. But it's not looking like we're a hopeless case. It's going to be a long struggle for the 4th spot between Arsenal, Chelsea and ourselves.