Ole reportedly ignored Carrick and Mckennas suggestions on tweaking the squad tactics when things were turning bad. They also spent all pre season on 433 if I recall, before throwing it out the window when Ronaldo came to accommodate.
This is crucial, I think, particularly in the context of people automatically 'absolving' Ole every time they retroactively praise Carrick and McKenna. Ole clearly had certain strengths relating to motivation (although team fell off after he was made perm manager in a way that should have been a portent.) But tactically, aside from City game where team had a more disciplined game-plan (as the counterpunching underdog), it was 'moments FC', with little evidence of patterns week by week.
I lurked on here at the time and, aside from the general 'blame game', people were accurately pointing out how undercoached the team looked, week upon week, even when getting into the CL - in seasons when they also benefited from other sides being in transition. The Emery final epitomized Ole's shortcomings against better tacticians and coaches, given gap between the teams on paper. Both coaches have subsequently come out and said that Ole had final say not only over tactics but the direction of training, alongside recruitment profiles: obviously they could try and tailor things slightly, but when you have Ole encouraging a more primitive style, alongside players whose egos are being flattered by parts of the club hierarchy, hangers on and the size of their contracts, with no SAF (or Pep, even Klopp etc) style authoritative manager/head-coach to keep them in line, or equivalent DOF/SD with talent and clarity of vision in shaping direction of preparation and play, then you end up with that kind of nearly-side...