I think that, in scientific terms, this presents a Sampling Error. The IMDB sample skews male, and critics point out that this may affect the results, as males may have a different opinion than females.
This does not mean that the male portion of the sample should curl up and die, nor even that they should STFU.
This does not mean that IMDB did something wrong.
This does not mean the ladies need to step up their game.
It could be statistically useful to see breakdowns of what sort of people voted which way. Maybe.
Or, at the minimum, it could be a way to apply a "corrective lens" of sorts. So if I see a woman-heavy film does only mediocre on IMDB, I might remember that they skew Male, and the movie might be better than reported.