I think that after a very long time we're finally looking like we're getting somewhere tactically. I like how Solskjaer is currently shaping the first team. I also like the fact that he seems to be taking no prisoners with his handling of the squad. It might hurt us somewhat in the short run because the lack of options will certainly create fatigue but, as far as our long term plans are concerned, it sends out a very strong message: "this is the way we're going to play and we feel that we can win anybody with it".
The main problem right now is depth because all three players there look irreplaceable. Matic is a very good holding midfielder but playing in each and every game 90 minutes has taken its toll on him. OK, he's not on Carrick's level of defensive positioning and reading of the game (for those who still doubt Carrick because he's not Pirlo or something, i'll just say that he was so solid in his prime that Fergie could deploy his 442ish formation, with one midfielder almost useless in the defensive transition -Giggs/Scholes- and Rooney playing closer to the forward than to the midfield area, and still win things) but he can do a good job at screening the back four. And from what i've seen thus far, we don't defend the ball at all times but for big portions of our games, we want to defend the space because we feel confident in our counter-attacking skills. So, no Herrera there for me. Excellent at closing down the first attacker but gets drawn to the ball way too often in order to shield the defence. Doesn't mean he can't do a job there but it would probably look similar to Hendo for the scousers. Which means that whenever the opposition will be able to beat the press, all kinds of runners will be running toward a back-peddling back-four line.
Plus Herrera is a pressing machine, a crucial one too in our current set-up. His importance in our attempts to win the ball back high up the pitch should never be underestimated as he's a leading figure in these attempts. And he's probably the best player we have on the pitch when it comes to winning second/loose balls in the attacking half. These possessions are very important because they allow us to stay high up the pitch, retain our attacking momentum and pin the opposition down. Finally, it escapes notice sometimes by some but Herrera can provide a solid outlet for our attacking from the right half-space. And one aspect of the "modernization" of our game under Solskjaer is that we aim to use the half-spaces for the creation of chances. It's good to have someone like Modric, who's incredibly skilled on the ball but doesn't shy away from his defensive duties, but these footballers are very few and therefore hard to get. I don't mean it as a dig at anybody but sometimes this talk about us prioritizing buying a DLP kind of reminds me the threads about the need to add some physicality to our midfield in the latter years of the Ferguson era. But Fergie knew better than anyone and he would never replace Giggs/Scholes with someone like Fellaini like the chosen one did.
Last but not least, i don't think that depending too much on Pogba is the end of the world for us. He's special and this is always the case with this type of players. Our game-plan should be able to get us over the line on most occasions (not hinder our league form) even without Pogba. This should be the main objective for the man who sits on the edge of the bench at OT. And that's where LvG and Mourinho failed miserably.
We're still a work in progress. Ole's persistence on Lingard shows his intention not only to apply pressing but also having someone on the pitch who'll be able to go after these crucial second balls which will give us the opportunity to remain high up the pitch. Both Martial and Rash are very good at many things but this is not one of them. If we could get an upgrade on Lingard, a player who can work the spaces between the lines and with an eye for the second/loose balls, we would instantly look better in the attacking half. A prime Ozil without the latter's tendency to go awol in big games would be perfect. Sanchez should be able to give us something in that department too if he manages to find any kind of form.
Other than that, i'd pick someone like Kante to share the position of the RCM with Herrera (or play alongside him when Pogba's missing). Kante is more sound positionally (could play as DM too but his height might be targeted), less effective going forward but the key thing is that he can also carry the ball through the lines. This particular ability is needed more than deep-lying play-making skills atm for the kind of football Ole wants us to play.
I risk saying this with the Liverpool game ahead of us in which we'll be put under a lot of pressure. I don't mind that at all. Bayern didn't look that they knew how to beat Klopp's pressing machine yesterday (the fact that their attacking midfielder, James, and their poacher rarely got in spaces where they could make a difference is proof of that) and Real Madrid looked clueless too in last year's final. The main difference was that they have FBs on both flanks who are superb with the ball at their feet in the build-up phase and this gives them the opportunity to stretch the pitch horizontally in their half and, subsequently, make the pressing team chase them around in larger areas. We can't do that... yet.
Our second weak spot is that our opponents seem to be getting behind Matic rather easily. Other than fatigue (and a possible decline of Matic), there are some times when the defence is a few meters behind where they should be when we have pushed bodies forward and/or a defender often hesitates to close down the attacker in between the lines. But this is a matter that i honestly expect to improve through training. Matic might not be the best player in the world for the holding role but we could do much worse imho and there are other positions on the pitch where the first xi is in dire need of improving. After five long years i feel rather optimistic.