For what it's worth, Charity Navigator gives them 4 out of 4 stars with a 98.33/100 rating: https://www.charitynavigator.org/ein/200049703
Meanwhile eg the American Cancer Society gets 73/100 and spends more on fundraising than WMF's entire budget, so oncologists can snort blow off hookers in Vegas, but nobody cares.
This is not to say they shouldn't be held accountable, but I do wonder what's the percentages of large charities that are "much worse" in terms of "we exist mostly to pay pretty good salaries to people whose purpose is to fundraise so we can repeat the loop".