The point is - I suppose - that if you genuinely think that he is tactically clueless, or the worst manager in the top flight (both of which has been claimed on here), you have to presuppose that the squad is actually brimming with individual quality: sit back and let them hit the opponent on the counter (with little or no coaching), and they will deliver against any opponent who leaves a bit of space to be exploited, including some of the best teams in Europe (coached by people who are frequently labeled geniuses on here).
Come up against any team that doesn't accommodate us - and we struggle immensely (in spite of having individual quality sufficient to punish top teams).
Does that make sense?
Not really, I would say. He may turn out to lack the nous, ultimately, to deal with teams of different descriptions (bus parkers, possession demons, gung-ho merchants - the whole spectrum) over the course of a season to a satisfactory degree (at the end of the day, as a United manager, "satisfactory degree" has to mean a proper challenge) - sure.
As it stands, though, he has clearly lacked at least two very important factors for most of the season: 1) a good (enough) midfield (a solid, at least, midfield combination). And 2) a distinct lack of creativity, individual players who are able to unlock defences (you absolutely need this - you can't balance that out, on the highest level, by "coaching" as such: if you don't have that player, or those players, you have to add him - or them - to your squad.)
You can put this on him as the primary decision maker (overrating his options), but the objective view would be that he simply hasn't had the required quality available on the whole, for whatever reason: naivety, Ed failing him in the market, calculated weakness (knew it wasn't great but it will be sorted by and by). But you can't say it has anything to do with an inherent tactical deficiency on his part: you don't overcome either the lack of a good enough midfield (in terms of sheer quality - Matic, Pereira) or the lack of a proper playmaker by "coaching". That would amount to either ignorance - or a downright disingenuous take on it, intentionally ignoring objective factors.