Pluspunten
The people truly care about the cause, and are very level-headed, down-to-earth, and proactive. This org had the least drama of any nonprofit I've worked for, and was also one of the most effective in terms of making significant, lasting improvements for LGBTQ youth. Regarding internal hierarchies: again one of the best groups I've had the pleasure of working with. Barely any ego. Most people just care about getting the work done effectively and efficiently without caring about who gets credit or who's in charge. I can't speak to the overall org, but at the chapter I was involved with, power was quite decentralized without much sacrificing of internal organization.
Minpunten
Nothing really. If pressed, I'd say perhaps that it was sometimes hard to know who to ask / approach if I had a question or needed direction. Because most of management were volunteers and had PT or FT jobs outside of GLSEN, it seemed that official positions changed hands more than at nonprofits that have a larger core of their own PT / FT employees. So roles and duties changed somewhat frequently out of understandable necessity.