As I previously soft announced, I've been building a Kritik Guide. Thanks to using Google Docs as a medium, refinements will always be easy to implement, but it's essentially complete. With this, there should no longer be difficultly in answering 'What's a K?'
I'm proud to say it is co-authored by Ramshutu, by far our most active voter and member of the moderation team, whom understands Kritiks far better than I.
Please use this tool for good rather than evil: https://tiny.cc/Kritik
Right now editing is set to be open for suggestions. However, at some point in the future I expect to be forced to lock that, and make this thread the suggestion point for any edits.