Pros
Weeding through the overly-enthusiastic "save the planet" heroes, you meet some pretty nice people who are very grounded and good at what they do.
Kontras
What's the point of meetings, if they're only meetings to talk about other meetings? Why are half my e-mails calendar invites to meetings where you're requested to be there but don't actually contribute? Why are there some project managers who manage projects that they clearly are incapable of managing? What's the point of a deadline, if it takes two weeks just to pass it along to another person? Why is it that half the time, the person that is needed the most happens to be on vacation or "away from the desk" for days? Again, when it comes to meetings, why is everyone in meetings all the time? How does anything ever get done? When it's nice outside, expect everyone to be on vacation.