I don't think the system failed because it was crude or simplistic though. I think it was let down by poor recruitment and a failure to implement further tweaks whenthey were required. We needed a replacement for JOC, a stronger more dynamic CM to compete/offer an alternative to Norwood, and a box-to-box type to replace Lundstram. We instead overpaid for youngsters who were expected to play at the highest level in a unique system they'd had no prior experience of.
There were lots of pretty triangles and patient build up play during the first four years, so the accusation that the fans always demand "
KICK IT FORRARD!! GERRITINT BOX!!! WHAT THA PASSING IT RARNDT DEFENCE FUAR!! HAVE A BASTUD SHOT WILL THA!!" is a little unfair - that's only when we're not doing very well
The truth is that the board thought they could drop Slav in and he would get the team promoted back to Prem without having to spend any funds on transfers. However Slav needed investment and time to implement his own style of play - United had neither and his appointment looks very naive in hindsight and probably cost us a run at the automatic places.