Pros
It's the leading big conservation organization in the world, with a great brand that the marketing group, despite its best/worst efforts, has not yet managed to destroy.
Cons
Oh, management changes its mind about the direction of the company every two weeks or so -- when it has a direction in mind, that is. There's a huge gap between senior leadership and the rest of the company: ideas and creativity just die at a certain point in the hierarchy, and it's easy for smart, entry-level people to get discouraged there. In a way, the place is just way too successful for its own good -- big-donor fundraising rules the roost, and the prevailing ethos is very conservative, very risk-averse, and frankly not very engaged at reignited an American conservation movement. You get the sense that everyone would be happy if they just cultivated 200 extremely rich donors and forgot about mass appeal. The Nature Conservancy's reputation and success at attracting donors of a certain age masks significant internal decay.