The simplicity of it is logic defying. It used to be that you had to find crosswalks or move puzzle pieces or type blurred letters and numbers, but NOW all the sudden I can just click a box and HEY!, I'm human?
That's hardly the Turing Test I'd expected.
Yeah at least Google will let you in after you solve 5 puzzles. It's shit but it's possible. With CloudFlare you are at the mercy of whatever hidden criteria they're using.
If you change your user agent from Firefox to Chrome for instance, CloudFlare will never let you through.