What's interesting is that we all KNOW what the answer to the problem is, but no one is going to go out on a limb and say it. So let me do so - HN needs a paid, full time, editor who will go through the submissions not to approve of what he/she likes (though you could go with a council of three if you're really worried about that), but to make sure they are real links to real articles - and that have the time to do the research to insure that the article is what it claims it is about, and hasn't been posted 20 times in the last week under slightly different names.
I always found the boards I enjoyed best back when I ran a C-64 BBS (yes, that was a BBS running ON a C-64 with a 1200 baud modem and two floppy drives) were the ones with appropriately benevolent "dictators" who used a light touch to keep things real and on track. I can't say I've seen anything on the internet to convince me that there's been a notable improvement on such.