I find HN's showdead feature provides a broader overview of our site. It let's you see links (mostly spam, sometimes hot topic dupes like 37 Signals' $100B valuation) as well as input from users who have been hellbanned.
As an opt-in feature I'm curious how many of us have opted-in, aren't aware of it, or went back to the base model of having that part of the system look after itself.
My default for anything: show me everything and give me the opportunity to filter it myself. I do the same thing for my customers in everything I build for them. This does several things:
a. It adds dimension. Whether 5% or 95% of the content is already dead, it's better to see it yourself than have someone give you that percentage.
b. It adds perspective. Actually seeing what content has become dead helps better understand the entire landscape.
c. It adds power. It's always more powerful to know what you're filtering.
d. It adds appreciation. Each tree means more after you've already seen the whole forest.