#2 Lack of intensity in midfield
The second problematic area is without doubt The Red Devils' midfield. Although there's a handful of decent guys in there, this season is proving somewhat unambitious. Without Paul Pogba, United have often lacked intensity and creativity in midfield.
It's only when the Frenchman is around the midfield comes alive. His combination especially with Martial and Luke Shaw can sometimes produce ecstatic flashes of artistry and energy. Unfortunately, it all becomes dull and uninspiring in his absence.
On Sunday that was the case. There was no Pogba, and subsequently things went south. The derby badly exposed a weakness in Nemanja Matic and Ander Herrera's game. For the better part, they struggled to stay afloat amidst City's rampage.
It's no wonder Mourinho’s men managed a paltry 6 shots against City’s 17, and 380 passes against City’s 704.
Ilkay Gundogan's clincher, coming off a build-up of 44 passes is a good confirmation of just how bland United can get. In all, there was so much room for City to roam around. Hopefully, Mourinho will fix these two glaring weaknesses in his team before it's too late.