<quote name="geni" date="2016-01-02" time="16:18:42 +0000">
Eh I'd argue at this point we have a fairly good idea of what went on.
We know from the high employee turnover in some areas and the odd slip (well that and pretty direct complaints https://meta.wikimedia.org/w/index.php?title=WMF_Transparency_Gap&diff=1... ) that, oh lets call it moral, isn't exactly rock solid at the WMF. The long term failure to fill the chief technology officer position probably doesn't help but there are reasons to suspect there are other issues.
Normally, the way to measure such morale (along with other things) is via a survey to measure employee engagement [0].
You can see past engagement surveys on metawiki [1].
[0] https://en.wikipedia.org/wiki/Employee_engagement [1] https://meta.wikimedia.org/wiki/Employee_engagement_survey
Greg