I'm comparing it to other polls on this website. Since, as you pointed out, NBF members can be more picky than most, a "no problems" rating of 70% or better on this site is very good. The highest recent rating I've seen for a notebook on this site is 85%, so I'd say 55-65% is good, 65-75% is great, and 75%+ is exceptional, based on what I've seen here. I'm sure all told, these numbers do not even approximate doing justice to the complete numbers, but if you take them in perspective with the rest of the site, then they provide a good picture of the overall satisfaction.