Since 10/11:
di Maria: 43/76 G/A in 201 Apps (170 starts) = 0.70 G/A per start
Nani: 38/40 G/A in 144 Apps (101 starts) = 0.77 G/A per start
Robben: 85/48 G/A in 146 Apps (130 starts) = 1.02 G/A per start
Ribery: 64/67 G/A in 184 Apps (158 starts) = 0.82 G/A per start
Hazard: 80/65 G/A in 248 Apps (215 starts) = 0.67 G/A per start
Silva: 39/64 G/A in 227 Apps (204 starts) = 0.50 G/A per start
Considering that both Nani and di Maria are the only standard wingers, and the fact that he played as an LCM in 13/14, I'd say he (and to some extent, Nani) hasn't been as "inconsistent" as the bandwagon constituents seem to be crying out every other day.
But yeah, inconsistent and numbers don't tell the story.