The global board is white, male, rich, North American or European, and very establishment. For a global organization this is a disgrace. There's also a very heavy presence of the Soros family, which adds to the lack of diversity (and innovation).
They have tried to improve management training and oversight, and even removed some low hanging bad managers, but some really terrible managers remain, particularly in the upper echelons, who are close to the founder and family. It's so financially comfortable that many stay in senior jobs for their entire careers - it really needs a term limit on the big jobs (following the Ford Foundation).
While it is better than some organizations, it needs to think about how it is handling the global north/south dynamics, which require some sensitively handled internal discussions.
The human resources team is large and strangely inept, with significant turnover problems, although there remain some individual stars within. Multiple key processes and procedures are behind and badly managed (a union was created in the US some years ago largely in response to these HR failures).
As with any large organizations, the department you're in will greatly impact your satisfaction, with some teams highly dysfunctional, others dynamic and creative. Ask around about the individual team leaders. (I score low on work/life balance because of the travel and obsessive email everyone-everything culture in my former team, but other departments won't be as bad).