I agree but unfortunately /. (or more specifically Dice) doesn't care about usability (have you seen Beta?), they only care about page views/eyes on ads.
Yes, Beta looks like ass. However, I serendipitously discovered recently that Beta is the only way to view slashdot on my mobile and for some reason it browses comments at 0 or below. The "happy" consequence of that is that I got to see more of the trolls than I'm accustomed to on the classic site through my computer, and I didn't know the goatse and gnaa trolls were still around. That fondly reminded me of the good-old days of shitdot.
IMHO a Greasemonkey userscript would be one way* to allow users to more easily avoid BH posts completely and help get the message to Dice that we don't want these steaming piles of elephant shit.
* I'd be happy to consider other methods such as native plugins or whatever...
This guy looks like they're on to something.