Nearly every option in this plugin comes with a link to more information about what the option is, and what it does to your site. Security for WordPress is a complicated issue and we have made one of the easiest plugins for WordPress security available today, with a full documentation and full support.
This is the only plugin that has an off-switch outside of WordPress, so if you DO lock yourself out, you can turn off the whole firewall outside of WordPress. Again, the only plugin to do so.
This plugin also does not ask you to edit anything relating to PHP files. We NEVER edit core files, either wp-config.php or .htaccess. Never.
I'm sorry you felt the need to rate this plugin so low, but please, contact me on support before rating it so low - as you'll see I answer every support question I get. I would really have appreciated it if you'd contacted me for help before rating it as such.