1) APC was at one time a great resource. I've been around here long enough to remember when there were only about 100 members. Since then the valuable info has been a little harder to find.
2) Depends. I can go days at a time. If I'm sitting on reserve it's more like once an hour.
3) Photos, the flight training forums and Hangar Talk
4) It used to be a good resource. However as membership has increased it's become more of a "my regional/major/flight school is better than yours" contest.
5) None really
6) See #4. I think a little more active moderation would help keep things focused at times.
7) APC has lost some of the original appeal. If it wasn't for the photos and some Hangar talk topics I would likely not be on here much at all any more.