Not too many complaints from the misguided plastic horde between 2005 and 2013 when they won plenty of trophies.
Post Fergie, they appointed their chosen one, in Moyes - selected by Fergie - then had Van Gaal, followed by Mourinho, and those 2 were then regarded as 2 of the best in the business - many at the time thought that they were at least on a par with Pep, if not superior to him. So, "what's your problem you red shirted horde?"
In the period from 2013, they spent a fortune on what were regarded as many of the best players available.
They did what United have always done; bought individuals and slotted them in, hoping they would fit well. This works at times - especially with good managers (like Fergie), but, not when you put your club on the managerial treadmill. Fergie himself had his fair share of failures, but he signed many of the best that became available in his 25+ years in charge.
Several managers were given inadequate time to get 'their' squad together, and potentially, Mourinho wasn't supported fully (so he said, and spat his dummy out). These were bad decisions in retrospect by bad management with short term thinking. They pandered to the horde in sacking managers early when any one of them may have 'got it right' given a little more time. Then came Giggsy, then Ole at the wheel - "..they know the club..." The horde were happy!!
There was never a shortage of money, even though the Glazers have bled millions from the club. They have spent slightly less than City in recent years, allegedly, but, they have bought more than their fair share of very high priced players. Their spending is said to be higher than Liverpool's or Chelsea's. So, you plastic horde - what's your problem? What do you want?
As King Louis said - not Van Gaal - but the monkey king in The Jungle Book film - as they look across to East Manchester - to the Etihad - and the misguided horde sing:-
Oo-bi-doo; we wanna be like you-oo-ooh