As others have said, he wasn't the first choice - far from it, so that says a lot. The same with the players themselves, no household name wants to go there so they are reduced to paying way over the odds for lightweight journeymen and then having to fit them into a system the player may not be familiar with. On top of this they cannot offload any of the overly-expensive flops they have like Antony, Casemiro, Rashford, Slabhead and a few others because of the -quite frankly- fucking ridiculous wage packets their contracts demand.
When you think that many of their big names are on approx 300 grand per week, and you see the sort of effort they are putting in (yes, Rashford in particular does nothing, absolutely nothing to justify his bloated wage packet), it is of no surprise that the club is in big trouble: drinking in the last-chance saloon and crossing fingers that this Amorim chap can -at the very least- bring CL football to the rags.
It is a tall order for a manager to come in halfway through the season and get the team into the top four at the first time of asking, particularly a team so dysfunctional and flawed, a team so inadequate in all playing positions that they are currently struggling to get out of the relegation zone.
The media have created the illusion that all is well at the swamp, the changing room is as harmonious as it's ever been, and every player is the best in the position that he plays. And it's patently untrue.