Pros
Some great people with a lot of dedication, and a charitable mission that deserves to succeed. Pleasant enough office and flexible working seems to suit many. Ok pay for the most part.
Cons
Directionless, largely due to low-calibre senior leaders. Culture of papering over cracks and going through the motions. Money wasted on pointless consultants and vanity projects. Very infrequent career opportunities, except when a meaningless new role is created on a whim. Frustrating place for anyone with a genuine desire to see positive change, or to develop their career without smoke and mirrors. There's more but you get the picture.