You can go through every aspect of the club while Ole was manager and see just how much of a failure he was at every single level.
The hapless scouting department, £250m of woeful signings, all the obscene player contracts signed under his management, the sub-standard coaching staff he assembled, the decline in fitness levels, the staggering declines in work rate, distances covered, duels won etc, despite his laughable promises after the 4-0 at Everton to do the exact opposite. The way he presided over the torpedoed careers of Martial, Rashford and Greenwood, the three young strikers everyone expected to flourish under a manager like Ole. And the way he cemented us as a club with more problems with player power than anywhere else.
He left us with a squad of emotionally fraught, chronically unfit, mentally weak serial losers, full of cliques with big rifts between them, and no leaders anywhere to be seen.
If we look at the list of players who we know, for whatever reason, have no long term future at United: Pogba, Martial, Rashford, AWB, Jones, Matic, Mata, Henderson, Bailly, Pereira, Lingard, Greenwood, Maguire, VDB, Cavani and Ronaldo.
16 players we know will never play a part of us winning a major title. Ole signed 5 of them, green-lit baffling new contracts for 8 of them, tricked Lingard into staying and was originally brought in to keep Pogba happy.
And this is ultimately why he'll never get another job at any club in any top European league. I don't even think Norway would consider him for the national team, his stock is that low.