Honestly, you might need to talk with some non-United fans about the reputation of Ole. Let's say it nicely, it is not that high. By that I mean, they kinda think that he is really shit (by them, I mean, literally anyone I talked to, coming from fans of clubs of different leagues). Even Moyes, a total joke, has a much higher reputation.
United job is the easiest managerial job in the world. You are close to unsackable. Take Ole for example, 450m spent (more than any other manager in the same time, also the highest wage bill in the world, and the highest net transfer in the world), no challenge for one of the big two trophies, not winning a tinpot trophy, get trashed 0-5 to Liverpool, and is completely safe. How on Earth is this one of the toughest job in the world? As long as you don't both totally suck and don't totally lose the dressing room, you are fine.
As for another example, take Moyes vs Gasperini vs Lopetegui. Three managers who had a high reputation before joining one of the biggest clubs in their country. All three of them sucked in their job at United/Inter/Madrid. Gasperini got sacked in September. Lopetegui got sacked in October. Moyes got sacked in April, so he survived 7 months more than the former, and 6 months more than the later.
United's job is the best job in football. Do the bare minimum and they will worship you and give a new contract. Don't even do that, and they will still worship you.