I see mainly three reasons for our underperforming.
Reason number one is the constant injuries. Espescially Martinez, Shaw and Malacia being out for so long has hurt us.
Secondly we have had to rely on a number of players who's not of the required quality: Onana, Dalot, AWB, Lindelöf, Evensen, Reguilon, Amrabat, McTominay, Anthony, (Garnacho, Höjlund). The last two are talented enough, but are not ready for the roles they have played this season.
The third reason is underperforming players: Varane, Casemiro, Eriksen, Fernandes, Rashford, Martial, Sancho. These players should be at the peak of their careers, and should be talented enough to be key players for us, but have been unavailable, low performing or shown no effort/proffesionalism.
How much of this can be attributed to our manager?
1. He might have pushed the team too hard in pre-season, causing injuries.
2. He has signed a lot of duds. Anthony doesn't have enough quality, and Mount is the wrong player for his role.
3. His set up demands high work rate from the forward, which do not favour his three most talented attackers, Rashford, Martial, Sancho.
4. His set up in midfield requires too much from the DM, espescially when Casemiro has become as immobile as he is now.
If we continue with ETH, he can't continue being in charge of transfers. But if someone can identify higher quality forwards, that fits his high pressing style, find a playmaking B2B midfielder, (which Mount and McTominay aren't), then I can see his style working better.