Rashford's output is down more than half (per 90 G+A, from 0.7 -> 0.34), even worse for Martial (0.7 -> 0.2). Their career average, which includes previous terrible seasons, is 0.6. I think, like these stats, it is more that this season is a drastic underperformance, while last season was slight overperformance.
Plus the injuries/zero form for Shaw, Casemiro, Mount, Varane, and Martinez. All having their worst seasons - shades of the Ole/Ralf season, where everybody was at their lowest.
e - if there had been logical recruitment in the summer, with 2 big signings at CM and striker, and cover at RB, I'd have expected 80+ points. With the shambolic signings made,I was hoping they could at least keep last season's level. And having seen the awful tactics, the hope was to at least get top 4.