Man, I was trying so hard to be out of this. But on this one key point, abstracted from everything else...
If you (generic "you" - I don't like "one doesn't") don't like anything in a category, then simply don't vote. Voting "No Award" is malicious.
If nothing appeals to you, it doesn't mean it can't appeal to anyone and, really, you're saying, "I'd rather deprive someone and their fans of a Hugo award based on my taste than simply stand aside and let those who
do like something decide it amongst themselves." It's nothing but spite. I don't know why the option ever existed (unless exactly for this when the fannish wars were about those commie weirdo Futurians or whatever) and, while I believe No Award has finished higher than some nominees, I don't think it's EVER been the top (non-)choice. Maybe once in the Nebulas, I can't remember; I doubt it. That might happen if there's an orchestrated campaign for it.
Really, there have been sub-par Hugo winners before (the Clifton/Riley novel is the standard example) but I doubt it much matters. On the other hand, can you imagine the "mainstream" lit snobs twisting it and making fun of a field that is so bad it can't even give awards to itself? Those NO AWARDs in the Hugo lists would be a far more obvious and permanent blight than just giving it to the best of your options on this slate, however non-optimal they may be. It would take "Hey, that was a weird year, they weren't very good" (except in Novel and Dramatic Short and several other categories where they may be as good or better than usual) and turn it into a "this was the year SF imploded" permanent scar.
The "voice" is abstention. Instead of the decisive representation of all fandom the nominees usually get with up to a whole thousand votes, this year's winners would only get a few hundred. Hah, that's telling them. Now that's no legitimate flagship award this year for the field.
And what would happen if NO AWARD lost to the SP slate generally and did result in a Leckie or Butcher defeat as their votes went to NO AWARD instead and there were still enough SP votes for Kevin J. Anderson?
And, besides, WWGRRRMD?