It used to be because of the nice people, but I feel like I've been meeting less and less decent furries nowadays. Most of the nice people I've met have been on the FA art site, but a lot of other forums I've gone to the "furries" there have been generally unlikable. I haven't been here much, though, and I'm ready to give this forum a try, hoping the people here are nicer than some other forums I've gone to.
As far as anthros go I love how diverse anthros are, and how there's so much you can do with them, how cool they look, and how they fit personality expressions better than humans can. Plus, being human, humans are pretty much the most uninteresting species because they're so much like me, being human, that it makes the characters less different and special, and in turn, less interesting.