I don't know because none of us are football or coaching experts but in the spirit of a discussion forum we can speculate.
Starting with results only. We're currently on course for 78 points this season - do I think we're massively overperforming relative to the quality of our squad? Not really. Nor do I think we're massively underperforming, because I think our squad is pretty good. But not complete.
Do I think Leipzig has better players than us and should be going through to the CL knockouts at our expense? No. Now there is an example of a team playing way above the level you'd expect given their squad.
Do I think our results are better than our performances have deserved? Potentially yes. We've overperformed our expected points this season, which isn't necessarily a massive worry as top teams tend to, however we've overperformed by quite a margin compared to other top teams (City and Chelsea have actually underperformed).
When you break down some of the individual aspects of the game.
Do we press like a top team?
Do we defend like a top team?
Are we good defending at set pieces?
Are we good at breaking down a low block?
For me the answer would be no.
However we are very good on the counter and in attacking transition.
Overall I'd be hard pressed to say we're anything more than an adequately coached team. I do think it's likely some other managers would have us looking more like a cohesive pressing and passing unit, and dominating games that we're currently scraping by.
Where I think Ole is doing a good job is the squad he's building, keeping the players happy, confident and in good spirits. Mourinho, LVG and Moyes drained the players morale, for the first time in a while it looks like the players actually like the manager which is important.
First off, I largely agree with the sentiment here as you probably appreciate where we was before Ole came in comparison to where we are now. You do seem to acknowledge that the changes in our approach isn't something we can take for granted. However, I'll try to give my opinion on your questions.
When you break down some of the individual aspects of the game.
Do we press like a top team? Considering top managers gets to buy an entire midfield at their top club, designed to press or dominate possession while our players in midfield are all leftovers from previous managers or academy graduates I think we're doing quite well. We have had a dysfunctional system in midfield probably since before Moyes, and under Mourinho this was especially true when a defensive approach was clearly hammered into our midfielders. It has taken some time but the mental aspect of that approach has finally been changed and we play more and more without fear. We try to press to the best of our abilities and despite not always being successful we're mostly matching top teams in running stats, which is an indication that we're not that far off.
I don't think we have a system that can make Matic, Pogba effective as runners or McTominay and Fred into creative masters so with the deficiencies in midfield I think we are managing this group of midfield options adequately in regards to their different skills and qualities. Sometimes we have to make use of Pogba since he is here but we can't change the team for him. If he doesn't run and press he wont play, and others like McTominay and Fred have been given a new chance under Ole and has gone up a few levels because of trust and a clear, easy to digest message about the expectations placed upon them. Bruno has had a great effect on our ability to press and create opportunities from winning the ball high up the pitch and attack quickly.
Do we defend like a top team? No. If we did, we would probably be a top team in world football right now. We just don't have the right cb partnership yet and having Jones and Rojo walking around the corridors is a reminder that we still have some work to do. Maguire needs someone next to him and there is plenty of room to improve for our fullbacks. However, I do think we've seen clear improvement on certain aspects with AWB, Shaw and Maguire and also getting better at playing out from the back. It's really, really slow process at times and frankly I'm a bit sick of that but I can also see that we are in fact getting better at it. We're not that experienced and many goals can be avoided with more of it. In regards to coaching I think we're fine. We look well organised and difficult to get through mostly, until we don't. It's not that we're leaking goals because of consistent issues, there is plenty to fix but tactically I think it's fine.
Are we good defending at set pieces? No.
Are we good at breaking down a low block? Good? Not as good as a great top team gets but... We're definitely better than last year, and if we can utilise all our attacking players this shouldn't be a problem. I think we've been pretty good at this since Bruno came, and teams have changed their approach to us because of it. Teams try to play more patiently against us without committing people on the counter because we'll punish them with our quick transitions if they do. Playing a low block for 90 minutes wont work so there is definitely gaps where United is capable of breaking down even a very organised unit.
I think we need to see more chemistry between players, so they know their teammates and where they are on the pitch but as I said that comes with experience and playing together. This is a very young team after all. I do think certain stuff should be pointed out to some players because it seem some never improves certain areas even when it's clear to see what they should be working on. One thing I would like to see is Luke Shaw form a partnership with Martial or whoever plays striker, and the right wing so that either player occupies a dangerous area at the time Luke has to cross/pass. Luke isn't assured enough in those situations close to goal, to make any decision, even if it's right in front of his nose he freezes up. They need to agree on two or three things and keep working on those movements consistently. That way it increases the chance of it coming off in a game, which it feels like just never happens.