At a personal level, the VX forum really is head and shoulders above most others.
Only a couple of Nissan forums even come close -I think that it has to do with the age of the enthusiast's cars. With the exception of the new Z, Nissan hasn't made an attainable performance car since 1999. Most big Nissan fans own cars that are more than 10 years old. They're not out there looking for the latest and most-expensive toy. I think that it just makes them more down to earth.

As for NASIOC, I'm a "Scooby Specialist" with a reasonably early membership date -however, since OT posts count, there are many clueless "specialists" out there -beware of some of their advice. If your post count didn't come from Tech than it doesn't matter.