Rangnick inherited an unbalanced playing squad (eg. lack of CMs), with certain core players in career worst form (Maguire WTF?!, Shaw, Rashford etc.), with players that have run roughshod over managers and coaches for years, that did not want to do extra training, that leaked to the media constantly, Greenwood was involved in the supposed physical and sexual abuse of his girlfriend and with Cavani always injured meant that when it came to goals it was CR7 or no one, Rangnick was given 6 months only, was not allowed to sign anyone over the January transfer window, did not have his own staff, players like Pogba and Lingard unmotivated and just running down their contracts for a free transfer etc.
and you saw for the first half of the first game he managed for United vs Crystal Palace (I think) where their shape, effort and pressing was far better... but it all just fell apart because these players won't do what they are told
United have gone 5 years without a trophy and a decade since winning the EPL during which they have shred through David Moyes, Van Gaal, Mourinho, Ole and now Rangnick... I am gaining a greater and greater appreciation for the job Alex Ferguson did after the Glazers took over... awesome that he kept the team winning EPLs and a Champions League
something is rotten at Old Trafford and I think the core issue is non-footballing people are in charge and they are prioritising commercial rather than footballing aims (eg. qualifying for the CL for the money rather than actually winning the CL)
but all you hear from Merson, Danny Murphy, Graeme Souness etc. is that it's the manager's fault and all those United old boys in Scholes, Neville, Keane, Rio etc. that engaged in such a fantastical propaganda for Ole as United headed straight for the iceberg just hanging Rangnick out to dry... the gall of a non-United manager trespassing on their turf
at one point, Paul Merson dismissed Rangnick for being unproven in England... you have to go back decades to find a top line English manager you disrespectful drunk