Disable anonymous reviews. Force them to reveal themselves if they want to reply. (and if they don't have FFN accounts, be sure to include a link to your LJ so they can reply and you can reply back.) You can do so in your Settings, on the page that comes up right after you log in.

I completely agree with your view on S/U. I tried to argue that once and people tore me to pieces with ridiculously flawed logic and capital letters. It was horrible.