There's just a fantastic range of great people on here, which is mostly why I keep coming back. And, like Nick, I even enjoy some of the people I've disagreed with.
Despite the rash of grouchy threads this winter, the community is still what separates BPL from anywhere else (Ok, and the articles).
I also think various people serve various "purposes," which makes a complete community. Some are science-oriented and know a lot of techie stuff. Some know a lot about places, and others about specific gear categories. Others chime in when they have an opportunity to help. And then there's the serious people, funny people, grouchy people, level-headed people...
...and then there's Douglas Ide. We're not sure where he belongs yet. :)
But seriously--loads of great people.